Data:K12n239/HOMFLYPT Polynomial

[math]\displaystyle{ -z^4 a^8-3 z^2 a^8-2 a^8+z^6 a^6+4 z^4 a^6+4 z^2 a^6+z^6 a^4+5 z^4 a^4+9 z^2 a^4+5 a^4-z^4 a^2-3 z^2 a^2-2 a^2 }[/math]