Data:K11a305/HOMFLYPT Polynomial

$- a 2 z 8 + a 4 z 6 -5 a 2 z 6 + 2 z 6 + 3 a 4 z 4 -9 a 2 z 4 - z 4 a -2 + 7 z 4 + 2 a 4 z 2 -5 a 2 z 2 -2 z 2 a -2 + 7 z 2 - a 4 + a 2 - a -2 + 2$