− q 13 / 2 + 3 q 11 / 2 − 7 q 9 / 2 + 11 q 7 / 2 − 15 q 5 / 2 + 15 q 3 / 2 − 15 q + 12 q − 8 q 3 / 2 + 4 q 5 / 2 − 1 q 7 / 2 {\displaystyle -q^{13/2}+3q^{11/2}-7q^{9/2}+11q^{7/2}-15q^{5/2}+15q^{3/2}-15{\sqrt {q}}+{\frac {12}{\sqrt {q}}}-{\frac {8}{q^{3/2}}}+{\frac {4}{q^{5/2}}}-{\frac {1}{q^{7/2}}}}
