id:A079187 - OEIS Search Results

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Number of isomorphism classes of non-anti-commutative closed binary operations (groupoids) on a set of order n.

+0
6

1, 4, 2334, 147124304, 2216860823492185, 13395780829563177947362200, 48974776899548402559651008669035131863, 151979850442580207421627199010701131897617064179661376 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`A079187(n)+A079190(n)=A001329(n).` `Each a(n) is equal to the sum of the elements in row n of A079188.`
	LINKS	`C. van den Bosch, Closed binary operations on small sets` `Index entries for sequences related to groupoids`
	CROSSREFS	`Cf. A079186, A079188, A079190.` `Sequence in context: A062407 A097476 A047676 this_sequence A131587 A066850 A066837` `Adjacent sequences: A079184 A079185 A079186 this_sequence A079188 A079189 A079190`
	KEYWORD	`nonn`
	AUTHOR	`Christian van den Bosch (cjb(AT)cjb.ie), Jan 03 2003`
	EXTENSIONS	`Edited, corrected and extended by Christian G. Bower (bowerc(AT)usa.net), Dec 12 2003`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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