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