n=4的一些解
..3..2..2..2..2..3..2....3..3..1..3..1..0..0....0..0..0..0..1..0..1
..2..0..2..2..2..1..2....0..0..0..0..0..0..2....3..3..3..2..3..2..3
..1..3..2..2..2..3..2....3..1..1..1..3..2..2....0..2..0..2..2..3..2
..2...0..2..3..3.3...2...0...2...0...2...0...2...3...0...3...3...3...3...3
..1..3..2..2..2..3..3....0..3..3..3..3..3..0....3..2..0..2..2..3..2
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