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