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