Data:L8a15/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^8 z^{-2} -2 a^6 z^{-2} -3 a^6+3 a^4 z^2+a^4 z^{-2} +3 a^4-a^2 z^4-a^2 z^2+z^2}