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