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.
SeoungJi Hong and SeungKyung Park
Yonsei University, Yonsei University
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
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