A079193 - OEIS

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A079193

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

0, 4, 3189, 178937854, 2483527282663335, 14325590003288422852078277, 50976900301814584087291456618542388746 (list; graph; refs; listen; history; 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 A079194.`
	LINKS	`C. van den Bosch, Closed binary operations on small sets` `Index entries for sequences related to groupoids`
	CROSSREFS	`Cf. A079192, A079194, A079196, A079199, A001426.` `a(n) = A001329(n)-A001425(n)-A027851(n)+A001426(n).` `a(n)+A079196(n)+A079199(n)+A001426(n)=A001329(n).` `Sequence in context: A172953 A132639 A132643 * A134908 A114498 A069120` `Adjacent sequences: A079190 A079191 A079192 * A079194 A079195 A079196`
	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), Nov 26 2003`

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Last modified February 14 08:47 EST 2012. Contains 205614 sequences.