− 1 q 5 / 2 + 3 q 7 / 2 − 8 q 9 / 2 + 12 q 11 / 2 − 18 q 13 / 2 + 20 q 15 / 2 − 20 q 17 / 2 + 17 q 19 / 2 − 13 q 21 / 2 + 8 q 23 / 2 − 3 q 25 / 2 + 1 q 27 / 2 {\displaystyle -{\frac {1}{q^{5/2}}}+{\frac {3}{q^{7/2}}}-{\frac {8}{q^{9/2}}}+{\frac {12}{q^{11/2}}}-{\frac {18}{q^{13/2}}}+{\frac {20}{q^{15/2}}}-{\frac {20}{q^{17/2}}}+{\frac {17}{q^{19/2}}}-{\frac {13}{q^{21/2}}}+{\frac {8}{q^{23/2}}}-{\frac {3}{q^{25/2}}}+{\frac {1}{q^{27/2}}}}
