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