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 Hybrid $d$-ary trees and their generalization Bull. Korean Math. Soc. 2014 Vol. 51, No. 1, 229-235 https://doi.org/10.4134/BKMS.2014.51.1.229Printed January 1, 2014 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 Downloads: Full-text PDF