Data:K12a721/HOMFLYPT Polynomial

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