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