id:A058132 - OEIS Search Results

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Number of self-converse monoids (semigroups with identity) of order n.

+0
5

1, 2, 5, 19, 84, 509, 3901, 48957 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Index entries for sequences related to monoids`
	CROSSREFS	`a(n)=A058133(n)*2-A058129(n).` `Sequence in context: A058131 A138911 A107377 this_sequence A002851 A124348 A052324` `Adjacent sequences: A058129 A058130 A058131 this_sequence A058133 A058134 A058135`
	KEYWORD	`nonn,more`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Nov 13 2000`
	EXTENSIONS	`a(8) from Max Alekseyev (maxale(AT)gmail.com), Jul 13 2009`

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Last modified December 18 21:37 EST 2009. Contains 171024 sequences.