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