A084270 - OEIS

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A084270

Number of labeled 2-chromatic (i.e. chromatic number = 2) graphs on n nodes.

0, 1, 6, 40, 375, 5176, 103236, 2922445, 116011230, 6433447396, 498234407451, 54007795331920, 8213123246906760, 1756336596363006841, 528975889250504033526, 224688018516023267969440, 134708289561117007261966815 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	LINKS	`Eric Weisstein's World of Mathematics, n-Chromatic Graph`
	FORMULA	`a(n) = A047864(n)-1. - Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 31 2003`
	CROSSREFS	`Cf. A084271, A084272.` `Sequence in context: A184266 A000683 A143342 * A053677 A204563 A196449` `Adjacent sequences: A084267 A084268 A084269 * A084271 A084272 A084273`
	KEYWORD	`nonn`
	AUTHOR	`Eric Weisstein (eric(AT)weisstein.com), May 24, 2003`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 31 2003` `One further term from David Wasserman (wasserma(AT)spawar.navy.mil), Dec 13 2004`

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Last modified February 17 09:12 EST 2012. Contains 206006 sequences.