[seqfan] A005043 - bijection sought

David Scambler dscambler at bmm.com
Tue Apr 17 07:21:11 CEST 2012

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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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