− q 26 − q 24 + q 22 + q 18 + q 16 − q 14 − q 10 + q 8 + q 6 + 2 q 2 {\displaystyle -q^{26}-q^{24}+q^{22}+q^{18}+q^{16}-q^{14}-q^{10}+q^{8}+q^{6}+2q^{2}}
