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