id:A137861 - OEIS Search Results

Search: id:A137861

Displaying 1-1 of 1 results found.

page 1

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

+0
1

1, 1, 2, 5, 18, 78, 522, 6168, 137352, 6002584, 509498932, 82545585936, 25251015686776, 14527077828617744, 15713242984902154384, 32000507852263778595584, 122967932076766466347469888 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n) = A054960(n) for even n and A007869(n) for odd 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: A103940 A039744 A006848 this_sequence A111916 A118187 A038720` `Adjacent sequences: A137858 A137859 A137860 this_sequence A137862 A137863 A137864`
	KEYWORD	`nonn`
	AUTHOR	`Tanya Khovanova (tanyakh(AT)yahoo.com), Apr 29 2008`

page 1

Search completed in 0.002 seconds

Last modified September 7 23:08 EDT 2008. Contains 143486 sequences.

AT&T Labs Research