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A057997 Number of labeled loops (quasigroups with an identity element). 1
1, 2, 3, 16, 280, 56448, 118594560, 4282251214848, 3398378138678329344, 75807214831601328114892800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

Index entries for sequences related to quasigroups

CROSSREFS

a(n)=A000315(n)*n. Cf. A057771.

Sequence in context: A141309 A179442 A215638 * A263802 A005273 A171990

Adjacent sequences:  A057994 A057995 A057996 * A057998 A057999 A058000

KEYWORD

nonn,hard

AUTHOR

Christian G. Bower, Nov 20 2000

STATUS

approved

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Last modified June 23 16:45 EDT 2017. Contains 288666 sequences.