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A241784 Number of simple connected graphs on n nodes with no subgraph isomorphic to C_5, where C_5 is the cycle graph with five vertices. 1
1, 1, 2, 6, 13, 44, 144, 577, 2457, 12499 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..10.

Travis Hoppe and Anna Petrone, Encyclopedia of Finite Graphs

T. Hoppe and A. Petrone, Integer sequence discovery from small graphs, arXiv preprint arXiv:1408.3644, 2014

Eric Weisstein's World of Mathematics, Cycle Graph

CROSSREFS

Cf. Squarefree (C_4) graphs A077269.

Sequence in context: A001373 A320804 A284223 * A211995 A245010 A057243

Adjacent sequences:  A241781 A241782 A241783 * A241785 A241786 A241787

KEYWORD

nonn,hard,more

AUTHOR

Travis Hoppe and Anna Petrone, Apr 28 2014

STATUS

approved

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Last modified October 15 22:25 EDT 2019. Contains 328038 sequences. (Running on oeis4.)