( q t + 1 1 − t ) ( q s 3 t 5 + s 4 t 4 + q 2 s t 5 + q s 2 t 4 + s 3 t 3 + 2 q s t 3 + s 2 t 2 + q 2 s − 1 t 3 + q t 2 + s t + q s − 1 t + 1 ) {\displaystyle \left({\frac {{q}{t}+1}{1-t}}\right)({q}s^{3}t^{5}+s^{4}t^{4}+q^{2}{s}t^{5}+{q}s^{2}t^{4}+s^{3}t^{3}+2{q}{s}t^{3}+s^{2}t^{2}+q^{2}s^{-1}t^{3}+{q}t^{2}+{s}{t}+{q}s^{-1}{t}+1)}
