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A123404
Number of alternately colorable perfect graphs on n nodes.
0
1, 2, 4, 11, 32, 136, 749, 6142, 71759, 1174550
OFFSET
1,2
LINKS
S. Hougardy, Home Page
S. Hougardy, Classes of perfect graphs, Discr. Math. 306 (2006), 2529-2571.
CROSSREFS
Sequence in context: A123434 A123424 A123449 * A178925 A298445 A294224
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Oct 18 2006
STATUS
approved