#include <bits/stdc++.h>
using namespace std;
template <typename Arg1>
void __f(const char* name, Arg1&& arg1) {
  cerr << name << " : " << arg1 << '\n';
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args) {
  const char* comma = strchr(names + 1, ',');
  cerr.write(names, comma - names) << " : " << arg1 << " | ";
  __f(comma + 1, args...);
}
int inf = 0x3f3f3f3f;
long long infl = 0x3f3f3f3f3f3f3f3fLL;
long double infd = 1.0 / 0.0;
const long long MOD = 1e9 + 7;
const long double pi = 2 * acos(0.0);
long long modi(long long a, long long n) {
  long long x = 1;
  while (n) {
    if (n & 1) x *= a;
    a *= a;
    n >>= 1;
  }
  return x;
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int tt = 1;
  cin >> tt;
  while (tt--) {
    int n;
    cin >> n;
    long long a = modi(2, n);
    long long b = 0;
    for (int i = 1; i <= n / 2 - 1; i++) {
      a += modi(2, i);
    }
    for (int i = n / 2; i <= n - 1; i++) {
      b += modi(2, i);
    }
    cout << a - b << '\n';
  }
  return 0;
}
