Data:L10n90/HOMFLYPT Polynomial

$a^6 z^{-2} +a^6-z^4 a^4-3 z^2 a^4-2 a^4 z^{-2} -5 a^4+z^6 a^2+4 z^4 a^2+7 z^2 a^2+a^2 z^{-2} +6 a^2-2 z^4-5 z^2-3+z^2 a^{-2} + a^{-2}$