id:A079183 - OEIS Search Results

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

+0
5

0, 6, 3201, 178937984, 2483527282664925, 14325590003288422852104768, 50976900301814583996024242298024434780, 155682086691137947272042494203068030678979503481450216 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`A001425(n)+a(n)=A001329(n).` `Each a(n) is equal to the sum of the elements in row n of A079184.`
	LINKS	`C. van den Bosch, Closed binary operations on small sets` `Index entries for sequences related to groupoids`
	CROSSREFS	`Sequence in context: A089501 A114184 A093884 this_sequence A030245 A048542 A140173` `Adjacent sequences: A079180 A079181 A079182 this_sequence A079184 A079185 A079186`
	KEYWORD	`nonn`
	AUTHOR	`Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003`
	EXTENSIONS	`Edited and extended by Christian G. Bower (bowerc(AT)usa.net), Dec 12 2003`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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