Some solutions for n=4
..0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x....0..x..1..x
..x..2..x..0....x..2..x..0....x..2..x..0....x..2..x..0....x..2..x..0
..0..x..3..x....0..x..3..x....0..x..1..x....0..x..3..x....0..x..3..x
..x..4..x..2....x..1..x..2....x..2..x..3....x..4..x..1....x..2..x..4
..5..x..0..x....4..x..5..x....1..x..4..x....1..x..5..x....1..x..5..x
..x..3..x..2....x..6..x..3....x..0..x..1....x..6..x..4....x..4..x..1
..2..x..1..x....5..x..4..x....4..x..3..x....3..x..0..x....2..x..3..x
