( u − 1 ) ( v − 1 ) ( u v − v + 2 ) ( 2 u v − u + 1 ) u 3 / 2 v 3 / 2 {\displaystyle {\frac {(u-1)(v-1)(uv-v+2)(2uv-u+1)}{u^{3/2}v^{3/2}}}}
