A079177 - OEIS

A079177

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

0, 8, 3320, 178964172 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	COMMENTS	`A079177(n)+A079180(n)=A001329(n).` `Each a(n) is equal to the sum of the elements in row n of A079178.`
	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. A079176, A079178, A079180.` `Sequence in context: A281323 A145260 A201100 * A298279 A299372 A299141` `Adjacent sequences: A079174 A079175 A079176 * A079178 A079179 A079180`
	KEYWORD	`nonn`
	AUTHOR	`Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003`
	STATUS	`approved`

Last modified February 4 23:12 EST 2023. Contains 360082 sequences. (Running on oeis4.)