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A090602 Number of n-element labeled groupoids with an identity. 2
1, 4, 243, 1048576, 762939453125, 170581728179578208256, 18562115921017574302453163671207, 1427247692705959881058285969449495136382746624 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Also labeled groupoids with an absorbant (zero) element.

LINKS

Table of n, a(n) for n=1..8.

Eric Postpischil Posting to sci.math newsgroup, May 21 1990

Eric Weisstein's World of Mathematics, Groupoid.

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: A091792 A300595 A320418 * A180722 A087587 A203511

Adjacent sequences:  A090599 A090600 A090601 * A090603 A090604 A090605

KEYWORD

nonn

AUTHOR

Christian G. Bower, Dec 05 2003

STATUS

approved

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Last modified April 3 01:31 EDT 2020. Contains 333195 sequences. (Running on oeis4.)