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A123405
Number of alternately orientable perfect graphs on n nodes.
0
1, 2, 4, 11, 33, 147, 896, 8673, 130683, 3012745
OFFSET
1,2
LINKS
S. Hougardy, Home Page
S. Hougardy, Classes of perfect graphs, Discr. Math. 306 (2006), 2529-2571.
CROSSREFS
Sequence in context: A277203 A123905 A123442 * A123457 A123455 A123447
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Oct 18 2006
STATUS
approved