A090588 - OEIS

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A090588

Number of labeled idempotent groupoids

1, 1, 4, 729, 16777216, 95367431640625, 221073919720733357899776, 311973482284542371301330321821976049, 374144419156711147060143317175368453031918731001856 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	LINKS	`Index entries for sequences related to groupoids`
	FORMULA	`a(n) = n^(n^2-n)`
	MAPLE	`a:=n->mul(mul(sum(1, j=0..n), k=0..n), m=1..n): seq(a(n), n=-1..7); # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Dec 31 2008]`
	CROSSREFS	`Cf. A002489, A030247, A076113` `Sequence in context: A159618 A059754 A134579 * A053986 A160737 A128846` `Adjacent sequences: A090585 A090586 A090587 * A090589 A090590 A090591`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Dec 03 2003`

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Last modified February 15 23:21 EST 2012. Contains 205860 sequences.