q 21 / 2 − 4 q 19 / 2 + 10 q 17 / 2 − 15 q 15 / 2 + 21 q 13 / 2 − 24 q 11 / 2 + 22 q 9 / 2 − 21 q 7 / 2 + 14 q 5 / 2 − 8 q 3 / 2 + 3 q − 1 q {\displaystyle q^{21/2}-4q^{19/2}+10q^{17/2}-15q^{15/2}+21q^{13/2}-24q^{11/2}+22q^{9/2}-21q^{7/2}+14q^{5/2}-8q^{3/2}+3{\sqrt {q}}-{\frac {1}{\sqrt {q}}}}
