A058117 - OEIS

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A058117

Number of commutative semigroups of order n with 1 idempotent.

1, 2, 5, 16, 62, 342, 3435 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	LINKS	`Table of n, a(n) for n=1..7.` `Index entries for sequences related to semigroups`
	CROSSREFS	`Column 1 of A058116.` `Sequence in context: A144188 A157314 A159603 * A007124 A112951 A124470` `Adjacent sequences: A058114 A058115 A058116 * A058118 A058119 A058120`
	KEYWORD	`nonn,hard`
	AUTHOR	`Christian G. Bower, Nov 09 2000`
	STATUS	`approved`

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Last modified May 18 13:07 EDT 2013. Contains 225419 sequences.