1 #include<stdio.h> 2 int main() 3 { 4     int i,n,m; 5     while(scanf("%d",&n)!=EOF) 6     { 7         while(n--) 8         { 9             scanf("%d",&m);10             int sum=3;11             for(i=1;i<=m;i++)12                 sum=2*sum-2;13             printf("%d\n",sum);14 15         }16     }17 }