q 30 − q 22 + q 20 − q 18 − q 14 − 2 q 12 + q 10 + 2 q 6 + q 4 + q 2 + 1 {\displaystyle q^{30}-q^{22}+q^{20}-q^{18}-q^{14}-2q^{12}+q^{10}+2q^{6}+q^{4}+q^{2}+1}
