Data:L9n25/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^4 a^2+3 z^2 a^2+a^2 z^{-2} +3 a^2-2 z^2-2 z^{-2} -3+ a^{-2} z^{-2} + a^{-2} }