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