id:A076280 - OEIS Search Results

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Number of 4-chromatic (i.e. chromatic number equals 4) simple graphs on n nodes.

+0
8

0, 0, 0, 1, 4, 31, 318, 5366, 155291, 7855628 (list; graph; listen)

	OFFSET	`1,5`
	LINKS	`Keith M. Briggs, Combinatorial Graph Theory` `Eric Weisstein's World of Mathematics, n-Chromatic Graph`
	CROSSREFS	`Cf. A076278, A076279, A076281, A076282.` `Sequence in context: A000858 A003436 A114475 this_sequence A141005 A122400 A107725` `Adjacent sequences: A076277 A076278 A076279 this_sequence A076281 A076282 A076283`
	KEYWORD	`nonn`
	AUTHOR	`Eric Weisstein (eric(AT)weisstein.com), Oct 06, 2002`
	EXTENSIONS	`a(10) from Keith Briggs, Mar 14 2006.`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.