id:A058130 - OEIS Search Results

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

+0
4

1, 2, 4, 19, 128, 1344, 20997, 1479686 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Index entries for sequences related to monoids`
	CROSSREFS	`a(n)=A058136(n)*2-A058135(n).` `Sequence in context: A018273 A047092 A064228 this_sequence A046082 A048774 A061213` `Adjacent sequences: A058127 A058128 A058129 this_sequence A058131 A058132 A058133`
	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 December 16 17:18 EST 2009. Contains 170825 sequences.