Some solutions for n=4
..0........0........0........0........0........0........0........0
..1.2......1.2......1.2......1.2......1.2......1.2......1.2......1.2
..3.0.4....0.3.4....3.0.1....3.4.3....0.3.4....3.4.5....3.0.1....0.3.1
..5.1.2.5..5.6.2.0..2.4.3.5..2.0.2.1..1.5.2.5..0.6.7.0..4.5.6.2..4.5.2.5
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