2009/10/26 by Svjetlan Feretic, Anthony J. Guttmann, Feretic, Svjetlan +1
Mathematics · #05A15 #05B50 #Combinatorics (math.CO) #FOS: Mathematics #math.CO #msc:05A15 #msc:05B50
paper · pdf · doi:10.48550/arxiv.0910.4791
26 pages, 14 figures
arxiv created 2009/10/26 · arxiv updated 2011/04/28
Column-convex polyominoes were introduced in 1950's by Temperley, a mathematical physicist working on "lattice gases". By now, column-convex polyominoes are a popular and well-understood model. There exist several generalizations of column-convex polyominoes; an example is a model called multi-directed animals. In this paper, we introduce a new sequence of supersets of column-convex polyominoes. Our model (we call it level m column-subconvex polyominoes) is defined in a simple way. We focus on the case when cells are hexagons and we compute the area generating functions for the levels one and two. Both of those generating functions are complicated q-series, whereas the area generating function of column-convex polyominoes is a rational function. The growth constants of level one and level two column-subconvex polyominoes are 4.319139 and 4.509480, respectively. For comparison, the growth constants of column-convex polyominoes, multi-directed animals and all polyominoes are 3.863131, 4.587894 and 5.183148, respectively.