Data:L11n321/HOMFLYPT Polynomial

$-a^2 z^6+a^4 z^4-5 a^2 z^4+3 z^4+3 a^4 z^2-11 a^2 z^2-2 z^2 a^{-2} +9 z^2+3 a^4-9 a^2-2 a^{-2} +8+a^4 z^{-2} -2 a^2 z^{-2} + z^{-2}$