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