Data:K12n872/HOMFLYPT Polynomial

Failed to parse (syntax error): {\displaystyle -a^2 z^8+a^4 z^6-5 a^2 z^6+2 z^6+4 a^4 z^4-10 a^2 z^4-z^4}{a^2}+ $Failed^{-1} +7 z^4-a^6 z^2+6 a^4 z^2-10 a^2 z^2-2 z^2}{a^2}+ $Failed^{-1} +8 z^2-a^6+3 a^4-4 a^2-1}{a^2}+ $Failed^{-1} +4}