n=6的一些解决方案:
..0....4....1....2....0....1....4....0....4....0....3....0....0....0....3....2
..1....4....0....5....6....5....6....3....1....5....6....3....5....2....0....5
..2....2....1....3....5....1....4....6....0....1....6....3....5....0....1....2
..5....3....5....3....3....0....3....5....2....5....2....4....5....0....1....4