Data:K13a2070/HOMFLYPT Polynomial

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[math]\displaystyle{ z^6 a^{-2} +2 z^6 a^{-4} +z^6 a^{-6} +5 z^4 a^{-4} +2 z^4 a^{-6} -z^4 a^{-8} -2 z^4+a^2 z^2-4 z^2 a^{-2} +4 z^2 a^{-4} +z^2 a^{-6} -2 z^2 a^{-8} -4 z^2+2 a^2-2 a^{-2} +2 a^{-4} -1 }[/math]