login
A123472
Number of weakly triangulated perfect graphs on n nodes.
1
1, 2, 4, 11, 33, 146, 886, 8483, 126029, 2866876, 95717334, 4534590984
OFFSET
1,2
LINKS
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
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