Data:K11a323/HOMFLYPT Polynomial

$a 2 z 6 + z 6 - a 4 z 4 + 3 a 2 z 4 -2 z 4 a -2 + 3 z 4 -2 a 4 z 2 + 3 a 2 z 2 -5 z 2 a -2 + z 2 a -4 + 4 z 2 - a 4 + a 2 -3 a -2 + a -4 + 3$