A287888 Unrooted unlabeled connected Ptolemaic graphs on n nodes.

1, 1, 2, 5, 14, 47, 170, 676, 2834, 12471, 56675, 264906, 1264851, 6150187, 30357300, 151798497, 767573729, 3919462385

Offset

1,3

Links

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

Maryam Bahrani and Jérémie Lumbroso, Enumerations, Forbidden Subgraph Characterizations, and the Split-Decomposition, arXiv:1608.01465 [math.CO], 2016.

Crossrefs

Sequence in context: A148338 A149903 A149904 * A115276 A343664 A327702

Adjacent sequences: A287885 A287886 A287887 * A287889 A287890 A287891

Keyword

nonn,more

Author

N. J. A. Sloane, Jun 21 2017

Extensions

Definition corrected (connected only) by Falk Hüffner, Jul 24 2019

Status

approved