A280766 Number of unlabeled, unrooted distance-hereditary graphs on n vertices.

1, 2, 4, 11, 31, 114, 454, 2078, 10168, 53045, 288037, 1617483, 9311503, 54723397, 327065591, 1982926671, 12169747393, 75486178107, 472601737413, 2983335066047, 18971431861215, 121440495203940, 782013670584330, 5063068510021079, 32942387619476871, 215306810250387250

Offset

1,2

Comments

Similar to A277862 except need not be connected.

Links

Table of n, a(n) for n=1..26.

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

Formula

Euler transform of A277862.

Crossrefs

Cf. A277862.

Sequence in context: A081557 A154603 A063254 * A123443 A123427 A123421

Adjacent sequences: A280763 A280764 A280765 * A280767 A280768 A280769

Keyword

nonn

Author

N. J. A. Sloane, Jan 17 2017

Extensions

a(9)-a(26) from Euler transform of A277862 by Falk Hüffner, Jun 27 2018

Status

approved