Above The Main Diagonal

import java.util.Scanner;

public class AboveTheMainDiagonal {
    public static void main(String[] args) {
        Scanner myScan=new Scanner(System.in);
        int n=Integer.parseInt(myScan.nextLine());
        long[][] matrix=new long[n][n];
        for (int row = 0; row < matrix.length; row++) {
            for (int col = 0; col < matrix[row].length; col++) {
                matrix[row][col]=(long) Math.pow(2,row+col);
            }
        }
        long sum=0;
        for (int row = 0; row < matrix.length-1; row++) {
            for (int col = row+1; col < matrix[row].length; col++) {
                sum+=matrix[row][col];
            }
        }
        System.out.println(sum);
    }
}