− 1 q 5 / 2 + 3 q 7 / 2 − 8 q 9 / 2 + 13 q 11 / 2 − 20 q 13 / 2 + 23 q 15 / 2 − 23 q 17 / 2 + 21 q 19 / 2 − 16 q 21 / 2 + 10 q 23 / 2 − 5 q 25 / 2 + 1 q 27 / 2 {\displaystyle -{\frac {1}{q^{5/2}}}+{\frac {3}{q^{7/2}}}-{\frac {8}{q^{9/2}}}+{\frac {13}{q^{11/2}}}-{\frac {20}{q^{13/2}}}+{\frac {23}{q^{15/2}}}-{\frac {23}{q^{17/2}}}+{\frac {21}{q^{19/2}}}-{\frac {16}{q^{21/2}}}+{\frac {10}{q^{23/2}}}-{\frac {5}{q^{25/2}}}+{\frac {1}{q^{27/2}}}}
