Matrix of Numbers

/* Write a program that reads from the console a positive integer number n (1 ≤ n ≤ 20)
 * and prints a matrix. Use two nested loops. */

import java.util.Scanner;

public class _09_MatrixOfNumbers {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter a whole number in the range [1 .. 20] for N: ");
        int numN = scan.nextInt();
        scan.close();

        if (numN > 0 && numN <= 20) {
            System.out.println("The Matrix of Numbers is:");
            for (int row = 1; row <= numN; row++) {
                for (int col = row; col < row + numN; col++) {
                    System.out.printf("%3d", col);
                }

                System.out.println();
            }
        } else {
            System.out.println("Error! - Invalid Input number!!!");
        }
    }

}