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