q 21 / 2 − 4 q 19 / 2 + 10 q 17 / 2 − 16 q 15 / 2 + 22 q 13 / 2 − 26 q 11 / 2 + 25 q 9 / 2 − 23 q 7 / 2 + 16 q 5 / 2 − 10 q 3 / 2 + 4 q − 1 q {\displaystyle q^{21/2}-4q^{19/2}+10q^{17/2}-16q^{15/2}+22q^{13/2}-26q^{11/2}+25q^{9/2}-23q^{7/2}+16q^{5/2}-10q^{3/2}+4{\sqrt {q}}-{\frac {1}{\sqrt {q}}}}
