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