About Half Permutations

[摘要] In 2011, Beaton et al. analytically proved that the number of directed column-convex permutominoes of size $n$ is given by $(n+1)!/2$.  In this paper, we provide a different proof of this statement using a bijective method. More precisely, we present a bi

[学科分类] 离散数学和组合数学

[关键词] Permutations;Polyominoes;Pattern avoiding permutations