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