q 13 / 2 − 2 q 11 / 2 + 2 q 9 / 2 − 3 q 7 / 2 + 2 q 5 / 2 − 2 q 3 / 2 + q − 1 q {\displaystyle q^{13/2}-2q^{11/2}+2q^{9/2}-3q^{7/2}+2q^{5/2}-2q^{3/2}+{\sqrt {q}}-{\frac {1}{\sqrt {q}}}}
