− q 13 / 2 + 4 q 11 / 2 − 9 q 9 / 2 + 15 q 7 / 2 − 21 q 5 / 2 + 23 q 3 / 2 − 24 q + 20 q − 15 q 3 / 2 + 9 q 5 / 2 − 4 q 7 / 2 + 1 q 9 / 2 {\displaystyle -q^{13/2}+4q^{11/2}-9q^{9/2}+15q^{7/2}-21q^{5/2}+23q^{3/2}-24{\sqrt {q}}+{\frac {20}{\sqrt {q}}}-{\frac {15}{q^{3/2}}}+{\frac {9}{q^{5/2}}}-{\frac {4}{q^{7/2}}}+{\frac {1}{q^{9/2}}}}
