Data:K12n835/HOMFLYPT Polynomial

Failed to parse (syntax error): {\displaystyle a^2 z^6-a^4 z^4+6 a^2 z^4+z^4-4 a^4 z^2+9 a^2 z^2-2 z^2}{a^2}+ $Failed^{-1} +2 z^2-3 a^4+4 a^2-2}{a^2}+ $Failed^{-1} +2}