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