id:A058136 - OEIS Search Results

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Number of asymmetric monoids (semigroups with identity) of order n, considered to be equivalent when they are isomorphic or anti-isomorphic (by reversal of the operator).

+0
4

1, 2, 4, 16, 91, 833, 11771 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Index entries for sequences related to monoids`
	CROSSREFS	`a(n)=(A058130(n)+A058135(n))/2.` `Sequence in context: A000090 A013115 A007171 this_sequence A156335 A026089 A052835` `Adjacent sequences: A058133 A058134 A058135 this_sequence A058137 A058138 A058139`
	KEYWORD	`nonn,more`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Nov 13 2000`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

AT&T Labs Research