public static int[][] muster(int n) {
		int[][] matrix = new int[n][n];
		for (int i = 0; i < n; i++) {
			for (int j = 0; j < n; j++) {
				if (j < i) {
					matrix[i][j] = j;
				} else {
					matrix[i][j] = i;
				}
				System.out.print(matrix[j][i]);
			}
			System.out.println("");

		}
		return matrix;
	}