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 A038015 #15 Dec 19 2021 13:50:34
%S A038015 1,4,378,2798336,3973658465625,1842282678468471349824,
%T A038015 433296503176904197061300041939288,
%U A038015 74235003800935257803650942510752495927455127552
%N A038015 Number of pointed (distinguished element) idempotent groupoids.
%H A038015 <a href="/index/Gre#groupoids">Index entries for sequences related to groupoids</a>
%F A038015 Here fixF[n] = n(1)*Product_{i, j >= 1}(Sum_{d|[i, j]}(d*n(d))^((i, j)*n(i)*n(j)-(i=j)n(i))).
%Y A038015 Cf. A001329, A030247.
%K A038015 nonn
%O A038015 1,2
%A A038015 _Christian G. Bower_, May 15 1998