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EXAMPLE
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a(3) = 1 because the unique polygonal knot of 3 edges can be drawn with vertex coordinates (4,9,5), (7,-9,5), (-9,-3,5).
a(6) = 1 because the unique polygonal knot of 6 edges can be drawn with vertex coordinates (4,9,5), (-7,-7,-5), (7,-9,5), (-1,9,-5), (-9,-3,5), (9,-5,-5).
a(7) = 1 because the unique polygonal knot of 7 edges can be drawn with vertex coordinates (9,-6,3), (-4,-7,3), (1,7,2), (-9,2,-10), (4,-5,10), (2,2,-2), (-5,2,5).
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