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