Generalized Stirling Permutations and Forests: Higher-Order Eulerian and Ward Numbers Articles uri icon

publication date

  • September 2015

start page

  • #P3.37

issue

  • 3

volume

  • 22

international standard serial number (ISSN)

  • 1077-8926

electronic international standard serial number (EISSN)

  • 1097-1440

abstract

  • We define a new family of generalized Stirling permutations that can be interpreted in terms of ordered trees and forests. We prove that the number of generalized Stirling permutations with a fixed number of ascents is given by a natural three-parameter generalization of the well-known Eulerian numbers. We give the generating function for this new class of numbers and, in the simplest cases, we find closed formulas for them and the corresponding row polynomials. By using a non-trivial involution our generalized Eulerian numbers can be mapped onto a family of generalized Ward numbers, forming a Riordan inverse pair, for which we also provide a combinatorial interpretation.

keywords

  • Generalized Stirling permutations
    Increasing trees and forests
    Generalized Eulerian numbers
    Generalized Ward numbers
    r-multipermutations
    Polynomials
    Recurrences