Data:10 108/HOMFLYPT Polynomial

$z^6 a^{-2} +z^6-a^2 z^4+3 z^4 a^{-2} -z^4 a^{-4} +3 z^4-2 a^2 z^2+2 z^2 a^{-2} -2 z^2 a^{-4} +2 z^2+1$