id:A165648 - OEIS Search Results

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Number of disconnected (simple) graphs on n vertices with each component regular.

+0
3

1, 2, 4, 7, 13, 23, 41, 77, 149, 397, 1246, 21135, 430933, 51156773, 3044120326, 1704554902881 (list; graph; listen)

	OFFSET	`2,2`
	EXAMPLE	`The a(2)=1 graph is: 2K_1. The a(3)=2 graphs are: 3K_1, K_1+K_2. The a(4)=4 graphs are: 4K_1, 2K_1+K_2, K_1+K_3, 2K_2.`
	CROSSREFS	`Equals A165647 minus A005177.` `Sequence in context: A114832 A136299 A003116 this_sequence A078038 A048888 A026724` `Adjacent sequences: A165645 A165646 A165647 this_sequence A165649 A165650 A165651`
	KEYWORD	`nonn`
	AUTHOR	`Jason Kimberley (Jason.Kimberley(AT)newcastle.edu.au), Sep 23 2009`

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Last modified December 2 11:54 EST 2009. Contains 167921 sequences.