A079564 Number of unlabeled graphs on n vertices with no induced subgraphs isomorphic to a P5 or complement of a P5 (P5 = path on 5 vertices.).

1, 1, 2, 6, 19, 78, 345, 1780, 10030, 62602, 429607, 3285435, 28623679, 296580989, 3897603006

Offset

1,3

Links

Table of n, a(n) for n=1..15.

J. L. Fouquet, A Decomposition for a class of (P5,P5-bar)-free graphs, Discrete Math. 121 (1993) 75-83.

V. Giakoumakis and I. Rusu, Weighted Parameters in (P5,P5-bar)-free graphs, Discrete Appl. Math. 80 (2-3) (1997) 255-261.

F. Hüffner, tinygraph, software for generating integer sequences based on graph properties, version 39d0919.

Crossrefs

Sequence in context: A138800 A008989 A057240 * A273988 A287897 A349401

Adjacent sequences: A079561 A079562 A079563 * A079565 A079566 A079567

Keyword

nonn,more

Author

Jim Nastos, Jan 24 2003

Extensions

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

Status

approved