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A123472 Number of weakly triangulated perfect graphs on n nodes. 1
1, 2, 4, 11, 33, 146, 886, 8483, 126029, 2866876, 95717334, 4534590984 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..12.

S. Hougardy, Home Page

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

FORMULA

Euler transform of A079457. - Falk Hüffner, Jan 15 2016

CROSSREFS

Sequence in context: A123437 A123435 A123409 * A277203 A123905 A123442

Adjacent sequences: A123469 A123470 A123471 * A123473 A123474 A123475

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Oct 18 2006

EXTENSIONS

a(10) and a(11) added using formula by Falk Hüffner, Jan 15 2016

STATUS

approved

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Last modified February 4 03:47 EST 2023. Contains 360045 sequences. (Running on oeis4.)