A054926 - OEIS

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A054926

Number of connected unlabeled graphs with n nodes and floor(n*(n-1)/4) edges.

1, 0, 0, 2, 5, 19, 132, 1579, 33366, 1343120, 105723785, 15968704512, 4520384306832, 2402302590759788, 2425409960013204929, 4647586298937784001491, 16787189663016572148130262, 114715448859703502223876433517 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,4`
	LINKS	`V. A. Liskovets, Some easily derivable sequences, J. Integer Sequences, 3 (2000), #00.2.2.`
	FORMULA	`a(n) = A054924(n, floor(n*(n-1)/4) ).`
	CROSSREFS	`Sequence in context: A089126 A113346 A198945 * A002786 A039719 A198203` `Adjacent sequences: A054923 A054924 A054925 * A054927 A054928 A054929`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), May 24 2000`
	EXTENSIONS	`Description corrected by David Wasserman (wasserma(AT)spawar.navy.mil), Mar 05 2002`

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Last modified February 15 14:20 EST 2012. Contains 205811 sequences.