A126753 - OEIS

A126753

Number of biconnected graphs on n nodes with chromatic number 5.

0, 0, 0, 0, 1, 3, 34, 627, 23262, 1686975, 231563309

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,6

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..11.

Keith M. Briggs, Combinatorial Graph Theory

CROSSREFS

A diagonal of triangle in A126749.

Sequence in context: A143638 A262673 A365040 * A047794 A332679 A256512

Adjacent sequences: A126750 A126751 A126752 * A126754 A126755 A126756

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Feb 18 2007

EXTENSIONS

a(11) from Michael Sollami, Feb 18 2012

STATUS

approved