q 9 / 2 − 4 q 7 / 2 + 7 q 5 / 2 − 12 q 3 / 2 + 14 q − 18 q + 15 q 3 / 2 − 15 q 5 / 2 + 9 q 7 / 2 − 6 q 9 / 2 + 2 q 11 / 2 − 1 q 13 / 2 {\displaystyle q^{9/2}-4q^{7/2}+7q^{5/2}-12q^{3/2}+14{\sqrt {q}}-{\frac {18}{\sqrt {q}}}+{\frac {15}{q^{3/2}}}-{\frac {15}{q^{5/2}}}+{\frac {9}{q^{7/2}}}-{\frac {6}{q^{9/2}}}+{\frac {2}{q^{11/2}}}-{\frac {1}{q^{13/2}}}}
