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