Data:L11a68/HOMFLYPT Polynomial

$-z^{5}a^{-3}-2z^{5}a^{-5}-z^{5}a^{-7}+z^{3}a^{-1}-z^{3}a^{-3}-3z^{3}a^{-5}-z^{3}a^{-7}+z^{3}a^{-9}+2za^{-1}-za^{-3}-2za^{-7}+za^{-9}+a^{-1}z^{-1}-a^{-3}z^{-1}+a^{-5}z^{-1}-2a^{-7}z^{-1}+a^{-9}z^{-1}$