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