A123404 - OEIS

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A123404

Number of alternately colorable perfect graphs on n nodes.

0

1, 2, 4, 11, 32, 136, 749, 6142, 71759, 1174550

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

S. Hougardy, Home Page

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

CROSSREFS

Sequence in context: A123434 A123424 A123449 * A178925 A298445 A294224

Adjacent sequences: A123401 A123402 A123403 * A123405 A123406 A123407

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Oct 18 2006

STATUS

approved