Data:K11n98/HOMFLYPT Polynomial

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