Some solutions for n=6
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..2....0....1....3....2....2....0....1....1....3....2....2....0....0....1....2
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..0....0....3....2....2....2....0....2....1....0....3....2....3....3....3....3
..3....2....3....1....3....1....2....1....0....2....0....3....1....2....1....1
..0....1....3....2....2....2....2....3....1....2....0....1....3....2....2....2
..1....1....0....1....1....0....0....2....0....0....1....0....3....0....1....1
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