Data:K12n821/HOMFLYPT Polynomial

Failed to parse (syntax error): {\displaystyle -z^8+a^2 z^6+z^6}{a^2}- $Failed^{-1} -7 z^6+5 a^2 z^4+5 z^4}{a^2}- $Failed^{-1} -17 z^4+7 a^2 z^2+7 z^2}{a^2}- $Failed^{-1} -17 z^2+3 a^2+3}{a^2}- $Failed^{-1} -5}