#include <bits/stdc++.h>
#define REP(i,a,b) for(int i=(a);i<=(b);i++)
using namespace std;
typedef long long LL;

int fac[]={1,107146451,559805077,679209364,644158465,641102369,363599536,539157852,309854856,663484182,578095319,765808214,585806050,579773866,861745250,5832229,242744764,899032987,150478174,627860803,259081142,544918953,907400235,421968194,278955367,974067448,996965954,473966292,479920311,752161465,316220877,1575312,620898940,405577532,956413299,690120224,24521750,576078970,929871923,14422365,251368199,582439362,220087090,98361446,763414075,980250487,618104354,398723029,764421236,476998749,682498929,152611299,345470378,403024660,140864216,134623568,373126171,461157687,363224613,526497651,95936601,19447777,584319463,569582206,9045328,933097914,959173997,559096347,12442609,508362944,167332441,75538458,275742306,137855279,60332461,598816162,31223863,767213175,564190300,222078457,336060741,632048012,895642779,171183381,851161246,248744620,635103992,605016577,853414712,546047842,626497524,867430659,904851726,475501650,298693437,288843364,52298443,743602491,479708090,125625755,491101308,662967999,385457627,482257159,393222011,245341950,474567292,196002818,754437203,542706821,565768255,524308015,545648343,58680787,792180189,246899319,99934426,788944266,676012445,610686655,968999,595032530,244819707,511710008,902492598,586350670,979137619,980655027,474700377,30153596,638587686,420932107,353049206,281562548,921459833,881746146,850268753,711117420,919203761,831442297,19426633,910061172,862345480,293462255,542955556,850500036,181909169,496532173,582702682,168757859,76479948,477639087,930180103,941723214,28581913,268124147,685075984,53790970,672818243,581968000,842267748,947532066,451116854,333707614,650009312,886294336,868829344,613566917,695702195,853242582,485348706,229827108,827117592,492711911,296974594,463847391,649090736,204857297,760019200,942731826,544075857,185735387,550588097,632593345,706629399,898187927,854821744,297803207,596729075,466541843,798967520,743420839,198998756,526623452,952046139,82926604,924044367,23777891,924258126,450837733,723816384,535478979,53975412,517436639,63932312,156530778,807928028,305569485,545662462,29493652,721996174,49456224,480391065,526281212,151117811,299085602,522961673,374481484,489252071,589831644,323604647,153393495,268164416,48301315,90383486,172827403,800588969,757146415,169338716,192601723,398699886,675113999,139831846,135840345,475501867,530389102,499294891,415376,114785958,576550918,294587621,714006296,457685563,875018827,254653019,813805606,172340144,498342367,258170000,43217172,67347853,909565792,16783532,495844744,402811155,497478507,110424728,441813281,581794056,561458723,196447201,404666335,118379156,910698506,850677980,722054885,777969547,12568481,748065817,60153582,228338256,433273104,521949545,52378412,701779420,407719831,445935909,752708852,15212588,650765251,762479457,398970308,808076198,39427394,8600742,746536789,586283387,655840660,152366450,741393509,811667359,415355660,386594397,97783708,333236625,778773518,205743536,570866962,242211856,218690396,27368307,562235036,987935647,849148138,692637504,438371670,422227498,845152439,883281454,243833737,59469516,765962345,89372661,972779460,599040453,5974669,324069108,180699112,833342486,793755411,766196482,468608739,812248718,494936006,59143878,606322308,732001446,635032673,759041389,554416265,86609485,559966857,658825730,586359929,562500933,889750731,724008021,806898745,995252950,135711291,340941507,700915958,324648749,722436788,59758328,371263376,265906250,850300987,61732363,887464462,625544428,279914778,644000584,180090545,9409022,788878910,631046702,358050946,714475801,883906209,808412394,528517448,316094660,724209709,544375689,996952918,79329551,136597179,64972739,930161980,585237443,422015194,62785084,374220150,44615465,1669644,42241449,58647723,929666976,307936472,361786913,974936549,107912795,225369475,703087658,480748381,2295485,880634238,805196528,188324947,595143852,926866806,742851567,666743467,973671409,837229828,243910108,697054929,57085695,469594245,199888908,649491763,274161939,558233225,470545797,526807168,244714186,411969385,54080847,427233799,579691190,754963083,169559902,270720182,588618211,145404005,478716222,293401592,614571924,321950925,459188207,805552722,508829534,304228537,355209596,534491822,947251800,225966128,986142683,701643375,439729802,759944655,349343101,48980788,212468510,840398449,259450229,983563606,704289349,442694685,899297830,121102289,405640886,513670887,961729079,235861787,281870391,270409779,798401543,369530217,888050723,920492865,298494436,756462483,628273353,656116726,247544137,294651705,412762822,489872437,736550105,461990959,534030848,365932794,610954403,440902696,253238972,682492613,522303856,839296517,85990869,288079694,617973869,825208191,111668651,884343068,125800325,805525713,184783824,425093556,56305184,939279559,912326839,855064933,756764497,973478770,706513987,632521245,897480658,888874515,168891766,413551441,450119928,687166876,349851104,804805577,160016093,64401654,546799298,304104093,927880474,870230497,673373340,543880181,83687737,876297919,298117414,6601621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const int STEP = (int)(2e5);
const int mo = (int)(1e9) + 7;

LL pow_mod(LL b, LL p, LL k) {
    LL res = 1;
    for (; p; p >>= 1) {
        if (p & 1) res = res * b % k;
        b = b * b % k;
    } return res;
}

inline int F(int x) {
    int st = x / STEP;
    int ret = fac[st], now = st * STEP;
    while(now < x) ret = 1LL * ret * (++now) % mo;
    return ret;
}

inline int iF(int x) {
    return pow_mod(F(x), mo - 2, mo);
}

inline int C(int n, int m) {
    if (n < m) return 0;
    return 1LL * (1LL * F(n) * iF(m) % mo) * iF(n - m) % mo;
}

char s[100005];
void solve() {
    int n;
    scanf("%d", &n);
    scanf("%s",s+1);
    int len = strlen(s+1);
    if(n & 1) {
        printf("0\n"); 
    } else {
        int tot = n - len;
        printf("%I64d\n", 1LL * (n - len + 1) * (C(tot, tot / 2) - C(tot, tot / 2 + 1) + mo) % mo);
    }
}

int main() {
    int T;
    scanf("%d", &T);
    while(T--) solve();
    return 0;
}