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