q 15 / 2 − q 13 / 2 + q 9 / 2 − q 7 / 2 + 2 q 5 / 2 − 3 q 3 / 2 + 2 q − 3 q + 1 q 3 / 2 − 1 q 5 / 2 {\displaystyle q^{15/2}-q^{13/2}+q^{9/2}-q^{7/2}+2q^{5/2}-3q^{3/2}+2{\sqrt {q}}-{\frac {3}{\sqrt {q}}}+{\frac {1}{q^{3/2}}}-{\frac {1}{q^{5/2}}}}
