n=4的一些解
…x..0..x..1…x..0..x..1….x..0
..1..x.0..x…1..x..0..x…1...x..0..x.…1..x.0..x
…x..1…x..2…x..1..x..2……x..1
..3…x..4…x…2…x..1…x…3…x..4..x…3..x..0..x…0…x..3..x
..x..2…x..1…x..3…x..4…x..5…x..6…x..1..x..4……x..1..x..0
..3..x..0..x…5..x..0..x…0..x..2..x…5.x..1..x…2.x..4..x
..x..2…x..5…x..1…x..0…x..0..x..6…x..4…x..3…x..3..x..1
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