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