Data:8 9/HOMFLYPT Polynomial

[math]\displaystyle{ -z^6+a^2 z^4+z^4 a^{-2} -5 z^4+3 a^2 z^2+3 z^2 a^{-2} -8 z^2+2 a^2+2 a^{-2} -3 }[/math]