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