n=4的一些解
..0..0..0..1..2..2..2....0..1..2..2..2..2..2....0..0..0..0..0..1..1
..0..0..0..1..0..2..2....0..0..2..2..2..2..2....0..0..0..0..0..2..2
..0..0..0..0..0..2..2....0..2..2..2..2..2..2....0..0..0..0..0..2..2
..0..0..0..0..0..2..2....1..2..1..2..2..2..2....0..0..0..2..0..2..2