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