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