id:A079172 - OEIS Search Results

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

+0
5

0, 8, 19570, 4294963804, 298023223876769393, 10314424798490535546154887938, 256923577521058878088611477224227878265543 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`A023814(n)+A079172(n)=A002489(n)` `Each a(n) is equal to the sum of the products of each element in row n of A079174 and the corresponding element of A079210.`
	LINKS	`C. van den Bosch, Closed binary operations on small sets` `Index entries for sequences related to groupoids`
	CROSSREFS	`Cf. A023814, A079173, A079174.` `Sequence in context: A079186 A079597 A079182 this_sequence A067074 A067070 A118546` `Adjacent sequences: A079169 A079170 A079171 this_sequence A079173 A079174 A079175`
	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 August 19 23:53 EDT 2008. Contains 142930 sequences.