Data:K12n846/HOMFLYPT Polynomial

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