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