Surprising symmetries in 132-avoiding permutations

Abstract

We prove that the total number $S_{n,132}(q)$ of copies of the pattern $q$ in all 132-avoiding permutations of length $n$ is the same for $q=231$, $q=312$, or $q=213$. We provide a combinatorial proof for this unexpected threefold symmetry. We then significantly generalize this result to show an exponential number of different pairs of patterns $q$ and $q^{\prime }$ of length $k$ for which $S_{n,132}(q)=S_{n,132}(q^{\prime })$ and the equality is non-trivial.

11 pages, 5 figures