A126728 Number of graphs on n nodes with edge chromatic number 2.

0, 0, 1, 3, 5, 10, 15, 26, 37, 58

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