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