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A123416
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Number of comparability perfect graphs on n nodes.
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0
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1, 2, 4, 11, 33, 144, 824, 6793, 75400, 1107853, 21021998
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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All comparability graphs are perfect. - Jakub Jablonski, Sep 07 2020
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LINKS
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Table of n, a(n) for n=1..11.
S. Hougardy, Home Page
S. Hougardy, Classes of perfect graphs, Discr. Math. 306 (2006), 2529-2571.
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CROSSREFS
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Sequence in context: A039707 A005470 A123471 * A123406 A123453 A351157
Adjacent sequences: A123413 A123414 A123415 * A123417 A123418 A123419
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane, Oct 18 2006
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EXTENSIONS
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a(11) from Jakub Jablonski, Sep 07 2020
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STATUS
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approved
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