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