A126738 - OEIS

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A126738

Number of connected graphs on n nodes with chromatic number 4.

0, 0, 0, 1, 3, 26, 282, 5009, 149551, 7694428, 667036310 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,5`
	LINKS	`Table of n, a(n) for n=1..11.` `Keith M. Briggs, Combinatorial Graph Theory`
	CROSSREFS	`A diagonal of triangle in A126736.` `Sequence in context: A048861 A053972 A204561 * A109074 A119293 A136046` `Adjacent sequences: A126735 A126736 A126737 * A126739 A126740 A126741`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane, Feb 16 2007`
	EXTENSIONS	`a(11) from Michael Sollami, Jan 29 2012.`
	STATUS	`approved`

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Last modified May 21 21:50 EDT 2013. Contains 225505 sequences.