A126729 Number of graphs on n nodes with edge chromatic number 3.

0, 0, 1, 5, 14, 46, 123, 375, 1061, 3331

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: A270636 A077335 A176640 * A336006 A098730 A244236

Adjacent sequences: A126726 A126727 A126728 * A126730 A126731 A126732

Keyword

nonn

Author

N. J. A. Sloane, Feb 16 2007

Status

approved