Data:9 24/HOMFLYPT Polynomial

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