− 1 q 5 / 2 − 1 q 9 / 2 − 1 q 13 / 2 + 1 q 15 / 2 {\displaystyle -{\frac {1}{q^{5/2}}}-{\frac {1}{q^{9/2}}}-{\frac {1}{q^{13/2}}}+{\frac {1}{q^{15/2}}}}
