OFFSET
1,2
LINKS
S. Hougardy, Home Page
S. Hougardy, Classes of perfect graphs, Discr. Math. 306 (2006), 2529-2571.
F. Hüffner, tinygraph, software for generating integer sequences based on graph properties, version 3e9b2ba.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Oct 18 2006
EXTENSIONS
a(11) and a(12) added using tinygraph by Falk Hüffner, Jun 29 2018
STATUS
approved