Data:K11a38/HOMFLYPT Polynomial

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