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