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