A123420 Number of diamond-free Berge perfect graphs on n nodes.

1, 2, 4, 10, 24, 75, 249, 1033, 4918, 28077, 186321, 1461912, 13705098, 159056641

Offset

1,2

Links

Table of n, a(n) for n=1..14.

S. Hougardy, Classes of perfect graphs, Discr. Math. 306 (2006), 2529-2571.

F. Hüffner, tinygraph, software for generating integer sequences based on graph properties, version 6c1dbe4.

Crossrefs

Sequence in context: A060776 A148090 A148091 * A000458 A089928 A173610

Adjacent sequences: A123417 A123418 A123419 * A123421 A123422 A123423

Keyword

nonn

Author

N. J. A. Sloane, Oct 18 2006

Extensions

a(11)-a(14) added using tinygraph by Falk Hüffner, Jun 30 2018

Status

approved