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A052431
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Number of perfect simple undirected graphs on n nodes.
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2
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1, 2, 4, 11, 33, 148, 906, 8887, 136756, 3269264, 115811998, 5855499195
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| A. Brandstaedt, V. B. Le and J. P. Spinrad, Graph Classes: A Survey, SIAM Publications, 1999.
S. Hougardy, Classes of perfect graphs, Discr. Math. 306 (2006), 2529-2571.
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LINKS
| S. Hougardy, Home Page
Brendan McKay, Perfect graphs
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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CROSSREFS
| Cf. A052433.
Sequence in context: A123451 A123470 A123450 * A076316 A082104 A099215
Adjacent sequences: A052428 A052429 A052430 * A052432 A052433 A052434
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KEYWORD
| nonn,hard
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com)
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EXTENSIONS
| McKay link, giving more terms, supplied by Vladeta Jovovic (vladeta(AT)eunet.rs), Jan 31 2003
a(12) added by N. J. A. Sloane (njas(AT)research.att.com) from the Hougardy paper, Oct 17 2006
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