id:A030260 - OEIS Search Results

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Number of nonisomorphic commutative groupoids with no idempotents.

+0
3

1, 0, 1, 38, 13872, 83360520, 10203847031340, 31023254154131753920, 2765562268014305034000397632, 8332535835277886736134596954072281240, 960864308045670310058158724983067048253497223280 (list; graph; listen)

	OFFSET	`0,4`
	LINKS	`Index entries for sequences related to groupoids`
	CROSSREFS	`Cf. A001329, A001425, A038021.` `Sequence in context: A055605 A096558 A145120 this_sequence A145122 A134182 A110017` `Adjacent sequences: A030257 A030258 A030259 this_sequence A030261 A030262 A030263`
	KEYWORD	`nonn`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Feb 15, 1998 and May 15, 1998`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

AT&T Labs Research