1 − 1 q + 2 q 2 − 2 q 3 + 3 q 4 − 3 q 5 + 2 q 6 − 2 q 7 + 1 q 8 {\displaystyle 1-{\frac {1}{q}}+{\frac {2}{q^{2}}}-{\frac {2}{q^{3}}}+{\frac {3}{q^{4}}}-{\frac {3}{q^{5}}}+{\frac {2}{q^{6}}}-{\frac {2}{q^{7}}}+{\frac {1}{q^{8}}}}