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