A126756 Number of biconnected triangle-free graphs on n nodes with chromatic number 3.

0, 0, 0, 0, 1, 1, 8, 36, 269, 2418, 29216, 458445, 9373692, 249530113

Offset

1,7

Comments

It is possible that the definition should say "connected" rather than "biconnected". Should be rechecked! - Max Alekseyev and Brendan McKay, Jun 17 2008

Links

Table of n, a(n) for n=1..14.

Keith M. Briggs, Combinatorial Graph Theory

Crossrefs

Sequence in context: A032770 A032794 A000757 * A203297 A181072 A058823

Adjacent sequences: A126753 A126754 A126755 * A126757 A126758 A126759

Keyword

nonn,more

Author

N. J. A. Sloane, Feb 18 2007

Status

approved