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A123415 Number of cograph contraction perfect graphs on n nodes. 0
1, 2, 4, 11, 33, 139, 737, 5220, 47299, 542268 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

REFERENCES

S. Hougardy, Classes of perfect graphs, Discr. Math. 306 (2006), 2529-2571.

LINKS

S. Hougardy, Home Page

CROSSREFS

Sequence in context: A123462 A123463 A123468 * A123469 A123448 A039707

Adjacent sequences:  A123412 A123413 A123414 * A123416 A123417 A123418

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Oct 18 2006

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Last modified February 17 11:35 EST 2012. Contains 206011 sequences.