Data:10 19/HOMFLYPT Polynomial

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