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