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