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