q 12 − 4 q 11 + 8 q 10 − 13 q 9 + 17 q 8 − 19 q 7 + 18 q 6 − 15 q 5 + 11 q 4 − 5 q 3 + 2 q 2 {\displaystyle q^{12}-4q^{11}+8q^{10}-13q^{9}+17q^{8}-19q^{7}+18q^{6}-15q^{5}+11q^{4}-5q^{3}+2q^{2}}
