View Compilation Error

0_0_26166382_13904.cpp: In function 'int main()':
0_0_26166382_13904.cpp:34:59: error: 's2' was not declared in this scope
   for(int i = 1; i <= n; ++i)ans = (ans+(long long)fac[i]*s2[n][i]%mod)%mod;
                                                           ^