n=3的一些解
..0..1..0..2..1..0..2....0..1..2..0..2..1..0....0..1..2..0..1..0..2
..0..1..0..2..1..0..2....0..1..2..0..2..1..0....0..1..2..0..1..0..2
..0..2..1..0..1..0..2....0..2..0..1..1..2..0....0..1..2..2..0..0..2
..0..2..1..0..1..0..2....0..2..0..1..1..2..0....0..1..2..2..0..0..2