id:A058105 - OEIS Search Results

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Number of commutative asymmetric semigroups of order n.

+0
5

1, 1, 3, 9, 39, 201, 1258, 10013 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`Index entries for sequences related to semigroups`
	CROSSREFS	`Cf. A001426. a(n) = A079201(n, A027423(n)).` `Adjacent sequences: A058102 A058103 A058104 this_sequence A058106 A058107 A058108` `Sequence in context: A080635 A130905 A030799 this_sequence A090012 A079096 A143293`
	KEYWORD	`nonn,hard`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Nov 09 2000`
	EXTENSIONS	`Updated Feb 19 2001. a(8) corrected Dec 26 2006`

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Last modified October 12 15:26 EDT 2008. Contains 144830 sequences.