Data:10 20/HOMFLYPT Polynomial

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