q 15 / 2 − 4 q 13 / 2 + 8 q 11 / 2 − 13 q 9 / 2 + 16 q 7 / 2 − 18 q 5 / 2 + 18 q 3 / 2 − 15 q + 10 q − 6 q 3 / 2 + 2 q 5 / 2 − 1 q 7 / 2 {\displaystyle q^{15/2}-4q^{13/2}+8q^{11/2}-13q^{9/2}+16q^{7/2}-18q^{5/2}+18q^{3/2}-15{\sqrt {q}}+{\frac {10}{\sqrt {q}}}-{\frac {6}{q^{3/2}}}+{\frac {2}{q^{5/2}}}-{\frac {1}{q^{7/2}}}}