Data:L11n372/HOMFLYPT Polynomial

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