− q 5 / 2 + 4 q 3 / 2 − 8 q + 12 q − 18 q 3 / 2 + 19 q 5 / 2 − 20 q 7 / 2 + 18 q 9 / 2 − 13 q 11 / 2 + 8 q 13 / 2 − 4 q 15 / 2 + 1 q 17 / 2 {\displaystyle -q^{5/2}+4q^{3/2}-8{\sqrt {q}}+{\frac {12}{\sqrt {q}}}-{\frac {18}{q^{3/2}}}+{\frac {19}{q^{5/2}}}-{\frac {20}{q^{7/2}}}+{\frac {18}{q^{9/2}}}-{\frac {13}{q^{11/2}}}+{\frac {8}{q^{13/2}}}-{\frac {4}{q^{15/2}}}+{\frac {1}{q^{17/2}}}}
