Data:L11n2/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^7 (-z)-a^7 z^{-1} +2 a^5 z^3+4 a^5 z+3 a^5 z^{-1} -a^3 z^5-3 a^3 z^3-6 a^3 z-3 a^3 z^{-1} +3 a z^3+5 a z+2 a z^{-1} -2 z a^{-1} - a^{-1} z^{-1} }