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A123415
Number of cograph contraction perfect graphs on n nodes.
0
1, 2, 4, 11, 33, 139, 737, 5220, 47299, 542268
OFFSET
1,2
LINKS
S. Hougardy, Home Page
S. Hougardy, Classes of perfect graphs, Discr. Math. 306 (2006), 2529-2571.
CROSSREFS
Sequence in context: A123462 A123463 A123468 * A123469 A123448 A039707
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Oct 18 2006
STATUS
approved