This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A090603 #23 Feb 16 2025 08:32:52
%S A090603 1,2,81,262144,152587890625,28430288029929701376,
%T A090603 2651730845859653471779023381601,
%U A090603 178405961588244985132285746181186892047843328,11790184577738583171520872861412518665678211592275841109096961
%N A090603 Number of n-element labeled groupoids with a fixed identity.
%C A090603 Also labeled partial groupoids with n-1 elements.
%H A090603 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Groupoid.html">Groupoid.</a>
%H A090603 <a href="/index/Gre#groupoids">Index entries for sequences related to groupoids</a>
%F A090603 a(n) = n^((n-1)^2). - _Alois P. Heinz_, Jul 30 2012
%t A090603 Table[n^(n-1)^2,{n,10}] (* _Harvey P. Dale_, May 31 2019 *)
%K A090603 nonn
%O A090603 1,2
%A A090603 _Christian G. Bower_, Dec 05 2003