A079199 - OEIS

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A079199

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

0, 2, 12, 130 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	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 A079200.`
	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 semigroups`
	CROSSREFS	`Cf. A001426, A079193, A079196, A079198, A079200.` `Sequence in context: A014235 A098628 A123553 * A214759 A185751 A090361` `Adjacent sequences: A079196 A079197 A079198 * A079200 A079201 A079202`
	KEYWORD	`nonn`
	AUTHOR	`Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003`
	STATUS	`approved`

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Last modified May 25 17:12 EDT 2013. Contains 225647 sequences.