id:A058112 - OEIS Search Results

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Idempotent semigroups of order n.

+0
3

1, 1, 3, 10, 46, 251, 1682, 13213 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`Index entries for sequences related to monoids` `Index entries for sequences related to semigroups`
	CROSSREFS	`Main diagonal of A058108.` `Sequence in context: A121138 A074508 A143500 this_sequence A020008 A000849 A092429` `Adjacent sequences: A058109 A058110 A058111 this_sequence A058113 A058114 A058115`
	KEYWORD	`nonn,hard`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Nov 09 2000`
	EXTENSIONS	`Updated Feb 19 2001`

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Last modified December 20 16:40 EST 2009. Contains 171081 sequences.