i think you are right.

來源: 於 2010-07-13 10:05:44 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

I have got the recursive functions as well as the direct functions in two specific cases: n=1 and n=m-1. I will post the result soon after checking correctness.

But the direct functions in general case have not been found yet.