id:A079173 - OEIS Search Results

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

+0
8

0, 5, 3306, 178981764, 2483527537092910, 14325590003318891522247046, 50976900301814584087291487087212542367 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`A027851(n)+A079173(n)=A001329(n)` `Each a(n) is equal to the sum of the elements in row n of A079174.`
	LINKS	`C. van den Bosch, Closed binary operations on small sets` `Index entries for sequences related to groupoids`
	CROSSREFS	`Cf. A027851, A079172, A079174.` `Sequence in context: A076908 A013782 A137841 this_sequence A073826 A159397 A024074` `Adjacent sequences: A079170 A079171 A079172 this_sequence A079174 A079175 A079176`
	KEYWORD	`nonn`
	AUTHOR	`Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003`
	EXTENSIONS	`More terms from Christian G. Bower (bowerc(AT)usa.net), Nov 26 2003`

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Last modified December 4 08:07 EST 2009. Contains 170310 sequences.