given formula = easy but doesnt work

[Reiner Martin]

The following seems to work:
C_n / 2   if n is even
( C_n + C_((n-1)/2) ) / 2   if n is odd

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Reiner Martin
reinermartin at hotmail.com
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----- Original Message ----- 
From: "Wouter Meeussen" <wouter.meeussen at pandora.be>
To: "Seqfan (E-mail)" <seqfan at ext.jussieu.fr>
Sent: Saturday, August 03, 2002 11:38 AM
Subject: given formula = easy but doesnt work


> ID Number: A007595 (Formerly M2681)
> Sequence:  1,1,3,7,22,66,217,715,2438,8398,29414
> (C_n + C_(n-1)/2 )/2, C = Catalan numbers (A000108).
> 
> can't work 'cause C_(2^n-1) is odd, (usually).
> So I can't see how to generate this sequence from the given formula.
> Can anyone help me out, here?
> 
> 
> 
> Have one that *does* work, but it's not Catalanish.
> 
> 
> Wouter Meeussen
> wouter.meeussen at pandora.be
> 
> 
>