Data:K12a1091/HOMFLYPT Polynomial

Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle z^8 a^{-2} +z^8-a^2 z^6+4 z^6 a^{-2} -z^6 a^{-4} +4 z^6-3 a^2 z^4+6 z^4 a^{-2} -3 z^4 a^{-4} +7 z^4-4 a^2 z^2+2 z^2 a^{-2} -3 z^2 a^{-4} +6 z^2-a^2- a^{-2} +3}