Data:7 6/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^6+2 a^4 z^2+2 a^4-a^2 z^4-2 a^2 z^2-a^2+z^2+1}