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 A356884 #8 Sep 02 2022 18:06:52
%S A356884 1,0,2,3,20,150,1254,14280,190000,2863728,49465080,954312480,
%T A356884 20303200488,473604468480,12007399511184,328671680500800,
%U A356884 9663415159357440,303695188102656000,10159173955921651776,360424299614544829440,13517056067747847719040
%N A356884 E.g.f. satisfies A(x)^A(x) = 1/(1 - x*A(x))^x.
%F A356884 a(n) = n! * Sum_{k=0..floor(n/2)} (n-2*k+1)^(k-1) * |Stirling1(n-k,k)|/(n-k)!.
%o A356884 (PARI) a(n) = n!*sum(k=0, n\2, (n-2*k+1)^(k-1)*abs(stirling(n-k, k, 1))/(n-k)!);
%Y A356884 Cf. A184949, A349559, A356786, A356787, A356885.
%Y A356884 Cf. A141209.
%K A356884 nonn
%O A356884 0,3
%A A356884 _Seiichi Manyama_, Sep 02 2022