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A090603 Number of n-element labeled groupoids with a fixed identity. 2
1, 2, 81, 262144, 152587890625, 28430288029929701376, 2651730845859653471779023381601, 178405961588244985132285746181186892047843328, 11790184577738583171520872861412518665678211592275841109096961 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Also labeled partial groupoids with n-1 elements.
LINKS
Eric Weisstein's World of Mathematics, Groupoid.
FORMULA
a(n) = n^((n-1)^2). - Alois P. Heinz, Jul 30 2012
MATHEMATICA
Table[n^(n-1)^2, {n, 10}] (* Harvey P. Dale, May 31 2019 *)
CROSSREFS
Sequence in context: A302722 A123177 A209585 * A020955 A230398 A120826
KEYWORD
nonn
AUTHOR
Christian G. Bower, Dec 05 2003
STATUS
approved

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Last modified March 28 11:46 EDT 2024. Contains 371241 sequences. (Running on oeis4.)