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A123425 Number of HHD-free perfect graphs on n nodes. 0
1, 2, 4, 11, 32, 128, 608, 3689, 27238, 244922 (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: A123418 A123412 A074408 * A123414 A123410 A123434

Adjacent sequences:  A123422 A123423 A123424 * A123426 A123427 A123428

KEYWORD

nonn

AUTHOR

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

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Last modified February 15 15:20 EST 2012. Contains 205823 sequences.