[seqfan] Re: A005043 - bijection sought

[Roland Bacher]

What do you mena by "no descent of length 2"?

You get always a descent of length 2 at the end 
(except for such a path of length 0).

Roland Bacher

On Tue, Apr 17, 2012 at 12:21:11AM -0500, David Scambler wrote:
> Empirically, the following seems to be counted by A005043 ( https://oeis.org/A005043 )
> 
> Dyck 2n-paths with all ascents length 2 and no descents length 2.
> 
> Proof anyone?
> 
> dave
> 
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