A123416 Number of comparability perfect graphs on n nodes.

1, 2, 4, 11, 33, 144, 824, 6793, 75400, 1107853, 21021998

Offset

1,2

Comments

All comparability graphs are perfect. - Jakub Jablonski, Sep 07 2020

Links

Table of n, a(n) for n=1..11.

S. Hougardy, Home Page

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

Crossrefs

Sequence in context: A039707 A005470 A123471 * A123406 A123453 A351157

Adjacent sequences: A123413 A123414 A123415 * A123417 A123418 A123419

Keyword

nonn,more

Author

N. J. A. Sloane, Oct 18 2006

Extensions

a(11) from Jakub Jablonski, Sep 07 2020

Status

approved