Data:L10n86/HOMFLYPT Polynomial

$a^8 z^{-2} +z^4 a^6+2 z^2 a^6-2 a^6 z^{-2} -2 a^6-z^6 a^4-4 z^4 a^4-3 z^2 a^4+a^4 z^{-2} +a^4+z^4 a^2+3 z^2 a^2+a^2$