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