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