id:A006961 - OEIS Search Results

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Mappings from n points to themselves with in-degree <= 2.
(Formerly M2584)

+0
4

1, 1, 3, 6, 15, 31, 75, 164, 388, 887, 2092, 4884, 11599, 27443, 65509, 156427, 375263 (list; graph; listen)

	OFFSET	`0,3`
	REFERENCES	`N. G. de Bruijn and D. A. Klarner, Multisets of aperiodic cycles, SIAM J, Algeb. Discrete Meth., 3 (1982), 359-368.`
	CROSSREFS	`Cf. A006961.` `Sequence in context: A034739 A097941 A117161 this_sequence A034740 A105476 A000599` `Adjacent sequences: A006958 A006959 A006960 this_sequence A006962 A006963 A006964`
	KEYWORD	`nonn,easy,nice`
	AUTHOR	`Simon Plouffe (plouffe(AT)math.uqam.ca)`

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Last modified September 5 01:44 EDT 2008. Contains 143476 sequences.