import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        Scanner sc=new Scanner(System.in);

        int n=sc.nextInt();

        while(n--!=0)

        {

            int a=sc.nextInt();

            System.out.println(""+f(a));

        }

    }

    public static int f(int a)

    {

        int [] a1=new int [22];

        a1[0]=1;int b=1;

        for(int i=1;i<=20;i++)

        {    a1[i]=a1[i-1]*2+b;    b <<= 1;    }

        return a1[a-1];

    }

}