A054960 - OEIS

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A054960

Number of unlabeled graphs with n nodes and an odd number of edges.

0, 1, 2, 5, 16, 78, 522, 6168, 137316, 6002584, 509498932, 82545585936, 25251015681176, 14527077828617744, 15713242984902154384, 32000507852263778595584, 122967932076766466336249888 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	LINKS	`V. A. Liskovets, Some easily derivable sequences, J. Integer Sequences, 3 (2000), #00.2.2.`
	FORMULA	`a(n)=(A000088(n)-A000171(n))/2.`
	CROSSREFS	`Cf. A007869 for graphs with an even number of edges.` `Sequence in context: A020127 A179500 A121396 * A004110 A048754 A176343` `Adjacent sequences: A054957 A054958 A054959 * A054961 A054962 A054963`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), May 24 2000`
	EXTENSIONS	`More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 19 2000`

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Last modified February 17 10:05 EST 2012. Contains 206009 sequences.