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