Two Bijections for Dyck Path Parameters
David Callan
Abstract
Here we give two bijections, one to show that the number of UUU-free Dyck n-paths is the Motzkin number Mn, the other to obtain the (known) distributions of the parameters "number of UDUs" and "number of DDUs" on Dyck n-paths. The first bijection is straightforward, the second not quite so obvious.
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