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