id:A057997 - OEIS Search Results

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Number of labeled loops (quasigroups with an identity element).

+0
2

1, 2, 3, 16, 280, 56448, 118594560, 4282251214848, 3398378138678329344, 75807214831601328114892800 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Index entries for sequences related to quasigroups`
	CROSSREFS	`a(n)=A000315(n)*n. Cf. A057771.` `Sequence in context: A006247 A052318 A141309 this_sequence A005273 A103898 A140383` `Adjacent sequences: A057994 A057995 A057996 this_sequence A057998 A057999 A058000`
	KEYWORD	`nonn,hard`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Nov 20 2000`

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