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