Data:L9a51/HOMFLYPT Polynomial

[math]\displaystyle{ z^6 a^{-2} +3 z^4 a^{-2} -2 z^4 a^{-4} -z^4+3 z^2 a^{-2} -4 z^2 a^{-4} +z^2 a^{-6} -z^2+ a^{-2} -3 a^{-4} + a^{-6} +1+ a^{-2} z^{-2} -2 a^{-4} z^{-2} + a^{-6} z^{-2} }[/math]