Labelled and unlabelled enumeration of $k$-gonal 2-trees

G. Labelle, C. Lamathe, P. Leroux

In this paper, we generalize 2-trees by replacing triangles by quadrilaterals, pentagons or $k$-sided polygons ($k$-gons), where $k\ge 3$ is fixed. This generalization, to $k$-gon…