A123415 Number of cograph contraction perfect graphs on n nodes.

1, 2, 4, 11, 33, 139, 737, 5220, 47299, 542268

Offset

1,2

Links

Table of n, a(n) for n=1..10.

S. Hougardy, Home Page

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

Crossrefs

Sequence in context: A123462 A123463 A123468 * A123469 A123448 A039707

Adjacent sequences: A123412 A123413 A123414 * A123416 A123417 A123418

Keyword

nonn,more

Author

N. J. A. Sloane, Oct 18 2006

Status

approved