A280764 Number of connected (6,2)-chordal bipartite graphs on n nodes.

1, 1, 1, 3, 5, 15, 37, 119, 365, 1258, 4346, 15773, 58058, 219016, 837482, 3250770, 12758359, 50602829

Offset

1,4

Comments

Bipartite (6,2)-chordal graphs are exactly the bipartite distance-hereditary graphs (see D'Atri and Moscarini). - Falk Hüffner, Jul 25 2019

Links

Table of n, a(n) for n=1..18.

A. D'Atri and M. Moscarini, Distance-hereditary graphs, Steiner trees, and connected domination, SIAM J. Comput. 17(3) (1988), 521-538.

F. Hüffner, tinygraph, software for generating integer sequences based on graph properties, version 9766535.

Jessica Shi, Enumeration of unlabeled graph classes: A study of tree decompositions and related approaches, 2015.

Crossrefs

Cf. A280765 (not necessarily connected).

Sequence in context: A265762 A018516 A138017 * A148503 A236571 A145939

Adjacent sequences: A280761 A280762 A280763 * A280765 A280766 A280767

Keyword

nonn,more

Author

N. J. A. Sloane, Jan 17 2017

Extensions

a(11)-a(18) added using tinygraph by Falk Hüffner, Jul 25 2019

Status

approved