Data:L8n4/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 a^6 z^2+a^6 z^{-2} +2 a^6-a^4 z^4-4 a^4 z^2-2 a^4 z^{-2} -6 a^4+2 a^2 z^2+a^2 z^{-2} +4 a^2}