Data:L11n68/HOMFLYPT Polynomial

$- z a 13 -2 a 13 z -1 + 2 z 3 a 11 + 6 z a 11 + 4 a 11 z -1 + z 3 a 9 + z a 9 - a 9 z -1 - z 7 a 7 -7 z 5 a 7 -14 z 3 a 7 -8 z a 7 - a 7 z -1$