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