A126733 - OEIS

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A126733

Number of connected graphs on n nodes with edge chromatic number 3.

0

0, 0, 1, 4, 8, 26, 58, 185, 500, 1677

(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 A126732.

Sequence in context: A262042 A227644 A074188 * A297695 A333894 A218079

Adjacent sequences: A126730 A126731 A126732 * A126734 A126735 A126736

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 16 2007

STATUS

approved