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