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