Some solutions for n=3
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..0....1....1....1....1....1....1....1....1....1....1....1....0....0....1....1
..1....2....2....0....2....0....2....2....2....0....2....2....1....1....2....2
..2....3....1....0....3....2....3....3....3....0....0....1....2....2....2....3
..3....3....3....2....3....3....4....4....4....2....3....1....3....3....3....4
..4....4....4....3....4....0....2....4....2....2....4....2....4....4....4....4
..2....1....4....4....4....0....4....5....4....3....5....3....2....3....4....2
..3....5....5....0....0....4....5....4....5....4....4....4....0....1....2....3
..0....5....0....0....2....0....5....4....3....5....5....3....4....0....2....1
..3....0....3....2....1....2....0....0....2....4....6....5....2....2....1....4
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