杭电ACM2042 //成长日记

#include<stdio.h>
int main()
{
	int m,n,i,sum;
	while(~scanf("%d",&m))
	{
		while(m--)
		{
		scanf("%d",&n);
		sum=3;
		for(i=0;i<n;i++)
			sum=2*sum-2;
		printf("%d\n",sum);
		}
	}
	return 0;
}