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