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