Data:K13a1019/HOMFLYPT Polynomial

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[math]\displaystyle{ z^6 a^{-2} +3 z^6 a^{-4} +z^6 a^{-6} -4 z^4 a^{-2} +5 z^4 a^{-4} -z^4 a^{-6} -z^4 a^{-8} -2 z^4+a^2 z^2-7 z^2 a^{-2} +5 z^2 a^{-4} -z^2 a^{-6} +z^2-2 a^{-2} + a^{-4} +2 }[/math]