A058109 - OEIS

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A058109

Semigroups of order n with 1 idempotent.

1, 2, 5, 20, 171, 5284, 1224331 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	LINKS	`Index entries for sequences related to semigroups`
	CROSSREFS	`Column 1 of A058108.` `Sequence in context: A184730 A181076 A156871 * A005331 A158872 A006893` `Adjacent sequences: A058106 A058107 A058108 * A058110 A058111 A058112`
	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 February 14 09:56 EST 2012. Contains 205614 sequences.