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