− 1 q 9 / 2 − 1 q 13 / 2 + 1 q 17 / 2 − 2 q 19 / 2 + 2 q 21 / 2 − 2 q 23 / 2 + 2 q 25 / 2 − 1 q 27 / 2 {\displaystyle -{\frac {1}{q^{9/2}}}-{\frac {1}{q^{13/2}}}+{\frac {1}{q^{17/2}}}-{\frac {2}{q^{19/2}}}+{\frac {2}{q^{21/2}}}-{\frac {2}{q^{23/2}}}+{\frac {2}{q^{25/2}}}-{\frac {1}{q^{27/2}}}}
