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A123450
Number of preperfect graphs on n nodes.
0
1, 2, 4, 11, 33, 148, 906, 8887, 136755, 3269254
OFFSET
1,2
LINKS
S. Hougardy, Home Page
S. Hougardy, Classes of perfect graphs, Discr. Math. 306 (2006), 2529-2571.
CROSSREFS
Sequence in context: A123419 A123451 A123470 * A052431 A076316 A304125
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Oct 18 2006
STATUS
approved