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