1608.01464Aug 4, 201614 pages, 4 figures, and a Maple worksheet; preprint of long version of IGCT 2014 article presented as "An Enumeration of Distance-Hereditary and 3-Leaf Power Graphs."

An Exact Enumeration of Distance-Hereditary Graphs

Cédric Chauve, Éric Fusy, Jérémie Lumbroso

Combinatorics Discrete Mathematics

arXiv PDF

Abstract

Distance-hereditary graphs form an important class of graphs, from the theoretical point of view, due to the fact that they are the totally decomposable graphs for the split-decomposition. The previous best enumerative result for these graphs is from Nakano et al. (J. Comp. Sci. Tech., 2007), who have proven that the number of distance-hereditary graphs on $n$ vertices is bounded by ${2^{\lceil 3.59n\rceil}}$ . In this paper, using classical tools of enumerative combinatorics, we improve on this result by providing an exact enumeration of distance-hereditary graphs, which allows to show that the number of distance-hereditary graphs on $n$ vertices is tightly bounded by ${(7.24975\ldots)^n}$

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---opening the perspective such graphs could be encoded on

3n

bits. We also provide the exact enumeration and asymptotics of an important subclass, the 3-leaf power graphs. Our work illustrates the power of revisiting graph decomposition results through the framework of analytic combinatorics.

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