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