n=4的一些解
..0..2..0....2..0..2....2..0..2....0..2..0....0..2..0....2..0..0....0..2..2
..2..0..0....2..0..0....0..0..2....0..0..2....0..2..0....0..2..2....0..0..0
..2..2..2....0..0..2....0..0..2....2..2..2....2..0..2....0..0..0....2..0..2
..0..2..0....2..2..0....2..0..2....0..0..2....2..0..2....2..2..2....2..2..0