Data:9 22/HOMFLYPT Polynomial

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