Some solutions for n=5
...0..................0..................0..................0
..-1.-1...............2..2..............-1..2...............1..3
..-1..1..5............3..2..7...........-3.-1.-5............0.-1.-5
...0..2..6..9.........5..2..2..0........-5.-2..0..1.........4..4..0..2
..-3.-2..1..6..3......0..3..1..2..2.....-5.-6.-5.-2.-5......3..7..3..2..4
..-6.-1.-2..3.-2..1...2..6..4..5..0.-2.-10.-9-10.-5.-1.-3...5..7..6..1..3..7
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