A079196 - OEIS

This site is supported by donations to The OEIS Foundation.

A079196

Number of isomorphism classes of non-associative commutative closed binary operations on a set of order n.

0, 1, 117, 43910 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,3`
	COMMENTS	`A079193(n)+A079196(n)+A079199(n)+A001426(n)=A001329(n).` `Each a(n) is equal to the sum of the elements in row n of A079197.`
	LINKS	`Table of n, a(n) for n=1..4.` `C. van den Bosch, Closed binary operations on small sets` `Index entries for sequences related to groupoids`
	CROSSREFS	`Cf. A001426, A079193, A079195, A079197, A079199.` `Sequence in context: A203626 A220600 A194613 * A113798 A151593 A066923` `Adjacent sequences: A079193 A079194 A079195 * A079197 A079198 A079199`
	KEYWORD	`nonn`
	AUTHOR	`Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003`
	STATUS	`approved`

Content is available under The OEIS End-User License Agreement .

Last modified May 19 15:07 EDT 2013. Contains 225432 sequences.