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