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