q 30 − q 28 − 2 q 22 + 2 q 20 − q 18 + q 16 − 2 q 12 + 2 q 10 − q 8 + 2 q 6 + q 4 + 1 {\displaystyle q^{30}-q^{28}-2q^{22}+2q^{20}-q^{18}+q^{16}-2q^{12}+2q^{10}-q^{8}+2q^{6}+q^{4}+1}
