Some solutions for n=7
..0....0....0....0....0....0....0....0....0....1....0....0....0....0....2....0
..1....2....2....2....1....2....1....1....1....0....3....1....1....2....0....1
..2....3....1....1....3....1....3....4....2....3....1....2....3....1....1....2
..6....1....5....3....2....3....4....3....5....4....4....3....2....4....3....5
..3....5....3....4....5....5....2....2....3....2....2....5....4....5....5....3
..4....4....4....5....4....4....6....6....6....5....5....6....6....3....4....4
..5....6....6....6....6....6....5....5....4....6....6....4....5....6....6....6
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