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