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