Difference between revisions of "User:Baijiangchen"
Baijiangchen (talk | contribs) (Created page with "If: <math>W(0):=1</math> <math>W(n):=\sum_{i=0}^{n-1}({n-1 \choose i}W(i)(x-i-1)!(2^{x-i-1}))</math> Then: <math>W(n)=(2n-1)!!</math>") |
(No difference)
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Revision as of 00:22, 22 July 2012
If:
Then:
