Data:K13n2241/HOMFLYPT Polynomial

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[math]\displaystyle{ 2 z^6 a^{-2} +z^6-a^2 z^4+7 z^4 a^{-2} -2 z^4 a^{-4} +2 z^4-2 a^2 z^2+8 z^2 a^{-2} -4 z^2 a^{-4} +z^2-a^2+3 a^{-2} -2 a^{-4} +1 }[/math]