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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
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
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 June 17 20:03 EDT 2024. Contains 373464 sequences. (Running on oeis4.)