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