$(q,t)$-Catalan numbers: gamma expansions, pattern avoidance and the $(-1)$-phenomenon

TL;DR

This paper explores new interpretations of $(q,t)$-Catalan numbers through pattern avoiding permutations, characterizes the $(-1)$-phenomenon for certain permutation subsets, and discusses their $q$-analogues and enumerations.

Contribution

It introduces novel interpretations of $(q,t)$-Catalan numbers and characterizes the $(-1)$-phenomenon for permutation classes avoiding specific patterns.

Findings

New interpretations of $(q,t)$-Catalan numbers via pattern avoidance

Complete characterization of the $(-1)$-phenomenon for certain permutation subsets

Enumeration of alternating permutations avoiding specific pattern pairs

Abstract

The aim of this paper is two-fold. We first prove several new interpretations of a kind of $(q,t)$-Catalan numbers along with their corresponding $\gamma$-expansions using pattern avoiding permutations. Secondly, we give a complete characterization of certain $(-1)$-phenomenon for each subset of permutations avoiding a single pattern of length three, and discuss their $q$-analogues utilizing the newly obtained $q$-$\gamma$-expansions, as well as the continued fraction of a quint-variate generating function due to Shin and the fourth author. Moreover, we enumerate the alternating permutations avoiding simultaneously two patterns, namely $(2413,3142)$ and $(1342,2431)$, of length four, and consider such $(-1)$-phenomenon for these two subsets as well.