Some solutions for n=5
...0...............0...............0...............0...............0
...1..6............3..1...........-2..0............4..3...........-3..0
...0..1..0.........1..1..5........-6.-5-10.........0..5..2........-6.-3.-3
...5..2..0.-5......5..5..1..4.....-3.-5-10.-6......1..3.-2.-6.....-2..2.-2.-5
...7..6..3.-2..3...9..6..1.-1..0..-2.-7.-7.-7.-4...1..0.-2.-4.-1...3..0.-5.-4.-8
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