n=4的一些解
..0..0..1..1....0..0..0..0....1..1..0..1....0..1..1..0....2..2..0..1
..1..1..0..0....2..2..1..1....0..0..0..1....2..2..0..3....2..2..0..1
..0..0..1..0....2..2..0..0....1..2..2..0....2..2..0..0....1..1..0..0
..0..0..1..0....0..0..0..0....1..2..2..0....0..0..1..1....0..0..0..0