Data:L9n21/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^2 a^4-a^4 z^{-2} -2 a^4+z^4 a^2+5 z^2 a^2+4 a^2 z^{-2} +8 a^2-z^4-6 z^2-5 z^{-2} -9+z^2 a^{-2} +2 a^{-2} z^{-2} +3 a^{-2} }