Data:L9n21/Jones 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 - q^{-5} + q^{-4} +q^3- q^{-3} + q^{-2} +q+2}