Data:K12n880/HOMFLYPT Polynomial

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