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