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
...3.4.1....3.4.5....2.3.4....3.4.1....3.4.3....0.3.4....2.3.4....3.4.0
..0.2.0.3..2.6.0.6..1.5.2.5..0.5.2.4..0.1.5.0..4.1.5.2..3.5.2.1..0.5.3.5
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