Data:L9n8/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^{-1} -z^3 a^5+2 a^5 z^{-1} +z^5 a^3+3 z^3 a^3+2 z a^3-z^3 a-2 z a-a z^{-1} }