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