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