Difference between revisions of "User talk:Baijiangchen"
Baijiangchen (talk | contribs) |
Baijiangchen (talk | contribs) |
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| Line 1: | Line 1: | ||
If: | If: | ||
<math>W(0):=1</math> | <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> | <math>W(n):=\sum_{i=0}^{n-1}({n-1 \choose i}W(i)(x-i-1)!(2^{x-i-1})</math> | ||
Then: | Then: | ||
| + | |||
<math>W(n)=(2n-1)!!</math> | <math>W(n)=(2n-1)!!</math> | ||
Revision as of 23:21, 21 July 2012
If:
Then:
