#include <bits/stdc++.h>
using namespace std;
int main()
{
long long p[32] = {0, 1, 4, 12, 28};
for (int i = 5; i <= 30; i++)
p[i] = p[i-1]*2 + 4;
int t, n;
cin>>t;
while (t--)
{
cin>>n;
cout<<p[n]<<endl;
}
return 0;
}
using namespace std;
int main()
{
long long p[32] = {0, 1, 4, 12, 28};
for (int i = 5; i <= 30; i++)
p[i] = p[i-1]*2 + 4;
int t, n;
cin>>t;
while (t--)
{
cin>>n;
cout<<p[n]<<endl;
}
return 0;
}
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