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