English

Super FiboCatalan Numbers and their Lucas Analogues

Combinatorics 2024-05-06 v2

Abstract

Catalan observed in 1874 that the numbers S(m,n)=(2m)!(2n)!m!n!(m+n)!S(m,n) = \frac{(2m)! (2n)!}{m! n! (m+n)!}, now called the super Catalan numbers, are integers but there is still no known combinatorial interpretation for them in general, although interpretations have been given for the case m=2m=2 and for S(m,m+s)S(m, m+s) for 0s40 \leq s \leq 4. In this paper, we define the super FiboCatalan numbers S(m,n)F=F2m!F2n!Fm!Fn!Fm+n!S(m,n)_F = \frac{F_{2m}! F_{2n}!}{F_m! F_n! F_{m+n}!} and the generalized FiboCatalan numbers Jr,FF2n!Fn!Fn+r+1!J_{r,F} \frac{F_{2n}!}{F_n! F_{n+r+1}!} where Jr,F=F2r+1!Fr!J_{r,F} = \frac{F_{2r+1}!}{F_r!}. In addition, we give Lucas analogues for both of these numbers and use a result of Sagan and Tirrell to prove that the Lucas analogues are polynomials with non-negative integer coefficients which in turn proves that the super FiboCatalan numbers and the generalized FiboCatalan numbers are integers.

Keywords

Cite

@article{arxiv.2308.13457,
  title  = {Super FiboCatalan Numbers and their Lucas Analogues},
  author = {Kendra Killpatrick},
  journal= {arXiv preprint arXiv:2308.13457},
  year   = {2024}
}