A079173 - OEIS

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A079173

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

0, 5, 3306, 178981764, 2483527537092910, 14325590003318891522247046, 50976900301814584087291487087212542367 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`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: A137841 A204940 A172954 * A073826 A159397 A024074` `Adjacent sequences: A079170 A079171 A079172 * 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 February 14 11:09 EST 2012. Contains 205614 sequences.