Some solutions for n=3
..2..0..0....0..0..0....0..0.-2...-2..0.-1....2.-1.-1...-1..1..2....0.-2.-2
.-2.-2.-2....1..0..0....0..0..0....0..0.-1....1.-1.-1....1..1.-2....1..1..1
..2..1..1....1..0.-2....2..2.-2....2..2..0....1..0..0....2.-2.-2....0..1..0
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