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