对于n=7,某些解的所有值为0到6
..0..0....0..0....0..1....0..0....0..0....0..0....0..0....0..1....0..1....0..1
..1..1....1..1....0..1....1..1....1..1....1..1....1..2....0..1....0..1....0..1
..2..2....2..2....2..3....2..2....2..3....2..2....1..2....2..2....2..2....2..2
..3..4....3..3....2..3....3..4....2..3....3..3....3..3....3..4....3..3....3..4
..3..4....4..4....4..4....3..4....4..4....4..5....4..4....3..4....4..4....3..4
..5..6....5..6....5..6....5..5....5..5....4..5....5..5....5..6....5..6....5..5
..5..6....5..6....5..6....6..6....6..6....6..6....6..6....5..6....5..6....6..6