A079569 Number of unlabeled, connected graphs on n vertices which have no induced subgraph isomorphic to a P5 and are chordal and prime.

0, 0, 0, 1, 1, 5, 15, 68, 343, 2131, 16020, 150841

Offset

1,6

Comments

P5 = path on five vertices. G chordal iff every cycle of size 4 or more has a chord. G prime if it has no module (homogeneous set.)

References

A. Brandstadt, F. Dragan, H.O. Le, R. Mosca, "New Graph Classes of Bounded Clique-Width," manuscript, 2002.

Links

Table of n, a(n) for n=1..12.

F. Hüffner, tinygraph, software for generating integer sequences based on graph properties, version e8699da.

Crossrefs

Sequence in context: A149629 A149630 A149631 * A149632 A149633 A149634

Adjacent sequences: A079566 A079567 A079568 * A079570 A079571 A079572

Keyword

more,nonn

Author

Jim Nastos, Jan 24 2003

Extensions

a(10)-a(12) added using tinygraph by Falk Hüffner, Jan 17 2016

Status

approved