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A123429 Number of K_4-free Berge perfect graphs on n nodes. 0
1, 2, 4, 10, 28, 112, 568, 4184, 42450, 576926, 10009664, 215100466 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..12.

S. Hougardy, Home Page

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

F. Hüffner, tinygraph, software for generating integer sequences based on graph properties, version 2e383f3

CROSSREFS

Sequence in context: A191501 A085549 A022492 * A207018 A006841 A003223

Adjacent sequences:  A123426 A123427 A123428 * A123430 A123431 A123432

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 18 2006

EXTENSIONS

a(11) and a(12) added using tinygraph by Falk Hüffner, Jan 16 2016

STATUS

approved

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Last modified January 19 15:37 EST 2020. Contains 331049 sequences. (Running on oeis4.)