id:A090602 - OEIS Search Results

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Number of n-element labeled groupoids with an identity.

+0
2

1, 4, 243, 1048576, 762939453125, 170581728179578208256, 18562115921017574302453163671207, 1427247692705959881058285969449495136382746624 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Also labeled groupoids with an absorbant (zero) element.`
	LINKS	`Eric Postpischil Posting to sci.math newsgroup, May 21 1990` `Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.` `Index entries for sequences related to groupoids`
	FORMULA	`a(n) = n^((n-1)^2+1)`
	CROSSREFS	`a(n) = A090603(n)*n. Cf. A090601.` `Sequence in context: A152793 A042769 A091792 this_sequence A087587 A063073 A093760` `Adjacent sequences: A090599 A090600 A090601 this_sequence A090603 A090604 A090605`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Dec 05 2003`

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

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