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