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A079575 Number of unlabeled, connected graphs on n vertices with no induced subgraph isomorphic to a bull-graph. 2
1, 1, 2, 6, 20, 93, 480, 2960, 19475, 140851, 1116717, 10329833, 121557264 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A bull-graph is formed by adding a 5th vertex to a 4-path adjacent only to the middle two vertices on the path.

LINKS

Table of n, a(n) for n=1..13.

C. De Simone and A. Sassano, Stability number of bull- and chair-free graphs, Discrete Appl. Math. 41 (1993) 121-129.

Travis Hoppe and Anna Petrone, Encyclopedia of Finite Graphs

Falk Hüffner, tinygraph, software for generating integer sequences based on graph properties, version ece94ef.

Eric Weisstein's World of Mathematics, Bull Graph

CROSSREFS

Cf. A244427 (no bull subgraph).

Sequence in context: A009244 A104985 A210690 * A078564 A079576 A079570

Adjacent sequences:  A079572 A079573 A079574 * A079576 A079577 A079578

KEYWORD

nonn,more

AUTHOR

Jim Nastos, Jan 24 2003

EXTENSIONS

a(10)-a(13) added using tinygraph by Falk Hüffner, Jan 15 2016

STATUS

approved

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Last modified September 28 14:14 EDT 2022. Contains 357070 sequences. (Running on oeis4.)