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