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