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A126728 Number of graphs on n nodes with edge chromatic number 2. 1
0, 0, 1, 3, 5, 10, 15, 26, 37, 58 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

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

Keith M. Briggs, Combinatorial Graph Theory

CROSSREFS

A diagonal of triangle in A123962.

Sequence in context: A074968 A308826 A090491 * A070557 A225751 A264397

Adjacent sequences:  A126725 A126726 A126727 * A126729 A126730 A126731

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 16 2007

STATUS

approved

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Last modified August 18 01:04 EDT 2019. Contains 326059 sequences. (Running on oeis4.)