Bulletin of the
Korean Mathematical Society
BKMS

ISSN(Print) 1015-8634 ISSN(Online) 2234-3016

Article

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Bull. Korean Math. Soc. 2014; 51(1): 229-235

Printed January 1, 2014

https://doi.org/10.4134/BKMS.2014.51.1.229

Copyright © The Korean Mathematical Society.

Hybrid $d$-ary trees and their generalization

SeoungJi Hong and SeungKyung Park

Yonsei University, Yonsei University

Abstract

We enumerate black and white colored $d$-ary trees with no leftmost \mbox{\LeftBBEDGE}$\,\,$-edges, which is a generalization of hybrid binary trees. Then the multi-colored hybrid $d$-ary trees with the same condition is studied.

Keywords: enumeration, generating function, hybrid tree

MSC numbers: 05A15