− q 13 / 2 + 4 q 11 / 2 − 9 q 9 / 2 + 14 q 7 / 2 − 18 q 5 / 2 + 19 q 3 / 2 − 19 q + 14 q − 10 q 3 / 2 + 5 q 5 / 2 − 1 q 7 / 2 {\displaystyle -q^{13/2}+4q^{11/2}-9q^{9/2}+14q^{7/2}-18q^{5/2}+19q^{3/2}-19{\sqrt {q}}+{\frac {14}{\sqrt {q}}}-{\frac {10}{q^{3/2}}}+{\frac {5}{q^{5/2}}}-{\frac {1}{q^{7/2}}}}
