id:A137858 - OEIS Search Results

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Number of unlabeled graphs with n nodes and an even sum of nodes and edges.

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0, 1, 2, 6, 16, 78, 522, 6178, 137316, 6002584, 509498932, 82545586656, 25251015681176, 14527077828617744, 15713242984902154384, 32000507852263779299344, 122967932076766466336249888 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n) = A054960(n) for odd n, and A007869(n) for even n.`
	CROSSREFS	`Cf. A054960 Number of unlabeled graphs with n nodes and an odd number of edges. A007869 Complementary pairs of graphs on n nodes. Also unlabeled graphs with n nodes and an even number of edges.` `Sequence in context: A009346 A009367 A114249 this_sequence A074740 A135068 A144690` `Adjacent sequences: A137855 A137856 A137857 this_sequence A137859 A137860 A137861`
	KEYWORD	`nonn`
	AUTHOR	`Tanya Khovanova (tanyakh(AT)yahoo.com), Apr 29 2008`

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Last modified December 3 01:16 EST 2008. Contains 151161 sequences.

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