Data:L11n338/HOMFLYPT Polynomial

$2 a 8 z -2 + a 8 -2 z 2 a 6 -5 a 6 z -2 -7 a 6 + 3 z 2 a 4 + 4 a 4 z -2 + 6 a 4 + z 6 a 2 + 4 z 4 a 2 + 5 z 2 a 2 - a 2 z -2 + a 2 - z 4 -2 z 2 -1$