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