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