>>30
辺上なら
(2h+2w)C3-2 (h+1)C3 -2 (w+1)C3
=(2h + 2w)(2h + 2w-1)(2h + 2w-2)/6 - 2(h+1)h(h-1)/6-2(w+1)w(w-1)/6
じゃないの?