func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t, n;     cin >> t;     while (t--) {       cin >> n;       int a = 0, b = 0, k = 2;       for (int i = 0; i < n / 2 - 1; i++) {         a += k;         k *= 2;       }       for (int i = 0; i < n / 2; i++) {         b += k;         k *= 2;       }       a += k;       cout << abs(a - b) << endl;     }   }   