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A123416 Number of comparability perfect graphs on n nodes. 0
1, 2, 4, 11, 33, 144, 824, 6793, 75400, 1107853, 21021998 (list; graph; refs; listen; history; text; internal format)
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

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Last modified January 28 01:36 EST 2023. Contains 359849 sequences. (Running on oeis4.)