Program Menampilkan Pattern Angka

Contoh program untuk menampilkan pattern angka seperti :

Source code :
import java.util.Scanner;
public class NewMain11 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("N : ");
        int n = in.nextInt();

        int a = n, c = n * 2 - 1, d = 0;
        for (int i = 0; i < c; i++) {
            for (int j = 0; j < c; j++) {
                for (int k = 0; k <= i; k++) {
                    if (j == k || i == k || j == c - (k + 1) || i == c - (k + 1)) {
                        d = a - k;
                        break;
                    }
                }
                System.out.printf("%-4d", d);
            }
            System.out.println();
        }
    }
}

Output :