id:A058129 - OEIS Search Results

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Number of monoids (semigroups with identity) of order n.

+0
9

1, 2, 7, 35, 228, 2237, 31559, 1668997 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Eric Postpischil Posting to sci.math newsgroup, May 21 1990` `Index entries for sequences related to monoids`
	CROSSREFS	`a(n)=A058133(n)*2-A058132(n).` `Sequence in context: A014307 A000154 A003713 this_sequence A101514 A111908 A060814` `Adjacent sequences: A058126 A058127 A058128 this_sequence A058130 A058131 A058132`
	KEYWORD	`nonn,hard`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Nov 13 2000`
	EXTENSIONS	`a(8) from Christian G. Bower (bowerc(AT)usa.net), Dec 26 2006`

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.