A126751 - OEIS

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A126751

Number of biconnected graphs on n nodes with chromatic number 3.

0, 0, 1, 1, 6, 30, 232, 2762, 50814, 1420183 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,5`
	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	`Keith M. Briggs, Combinatorial Graph Theory`
	CROSSREFS	`A diagonal of triangle in A126749.` `Sequence in context: A054721 A074111 A073087 * A009689 A133668 A121772` `Adjacent sequences: A126748 A126749 A126750 * A126752 A126753 A126754`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Feb 18 2007`

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Last modified February 17 06:27 EST 2012. Contains 205998 sequences.