Korean J. Math.  Vol 21, No 4 (2013)  pp.495-502
DOI: https://doi.org/10.11568/kjm.2013.21.4.495

A refined enumeration of $p$-ary labeled trees

Seunghyun Seo, Heesung Shin

Abstract


Let $\mathcal{T}^{(p)}_n$ be the set of $p$-ary labeled trees on $\{1,2,\dots,n\}$. A maximal decreasing subtree of an $p$-ary labeled tree is defined by the maximal $p$-ary subtree from the root with all edges being decreasing. In this paper, we study a new refinement $\mathcal{T}^{(p)}_{n,k}$ of $\mathcal{T}^{(p)}_n$, which is the set of $p$-ary labeled trees whose maximal decreasing subtree has $k$ vertices.


Subject classification

05A15, 05C05, 05C30

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References


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