− q + 2 q − 5 q 3 / 2 + 8 q 5 / 2 − 12 q 7 / 2 + 13 q 9 / 2 − 14 q 11 / 2 + 12 q 13 / 2 − 9 q 15 / 2 + 6 q 17 / 2 − 3 q 19 / 2 + 1 q 21 / 2 {\displaystyle -{\sqrt {q}}+{\frac {2}{\sqrt {q}}}-{\frac {5}{q^{3/2}}}+{\frac {8}{q^{5/2}}}-{\frac {12}{q^{7/2}}}+{\frac {13}{q^{9/2}}}-{\frac {14}{q^{11/2}}}+{\frac {12}{q^{13/2}}}-{\frac {9}{q^{15/2}}}+{\frac {6}{q^{17/2}}}-{\frac {3}{q^{19/2}}}+{\frac {1}{q^{21/2}}}}
