7 papers
Fibonacci and Catalan Numbers Meet in Staircase Polyominoes
Jean-Luc Baril, José Luis RamÃrez, Samuel RamÃrez +1
We study Fibonacci (staircase) polyominoes, a class of column-convex polyominoes whose lower boundary is a staircase with unit vertical steps. We derive multivariate generating fun…
Enumeration of paths in a hexagonal circle packing
Jean-Luc Baril, José Luis Ramà rez
We investigate paths in the hexagonal circle packing and enumerate them with respect to width, height, number of steps, area, and kissing number. Functional equations and the kerne…
Inversions in Colored Permutations, Derangements, and Involutions
Moussa Ahmia, José L. RamÃrez, Diego Villamizar
Arslan, Altoum, and Zaarour introduced an inversion statistic for generalized symmetric groups. In this work, we study the distribution of this statistic over colored permutations,…
Enumeration of Colored Tilings on Graphs via Generating Functions
José L. RamÃrez, Diego Villamizar
In this paper, we study the problem of partitioning a graph into connected and colored components called blocks. Using bivariate generating functions and combinatorial techniques,…
Generating Trees and Fibonacci Polyominoes
Juan F. Pulido, José L. RamÃrez, Andrés R. Vindas-Meléndez
We study a new class of polyominoes, called -Fibonacci polyominoes, defined using -Fibonacci words. We enumerate these polyominoes by applying generating functions to capture…
Grand zigzag knight's paths
Jean-Luc Baril, Nathanaël Hassler, Sergey Kirgizov +1
We study the enumeration of different classes of grand knight's paths in the plane. In particular, we focus on the subsets of zigzag knight's paths that are subject to constraints.…