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