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 A357084 #9 Sep 11 2022 10:06:30
%S A357084 1,0,2,6,98,990,19082,347046,8512226,220737390,6776521082,
%T A357084 225532370646,8413133799314,339965749171230,14995100013227882,
%U A357084 711308930246853126,36278600375671552322,1974411768891211652430,114394542828023045764442
%N A357084 E.g.f. satisfies log(A(x)) = (exp(x*A(x)) - 1)^2 * A(x).
%F A357084 a(n) = Sum_{k=0..floor(n/2)} (2*k)! * (n+k+1)^(k-1) * Stirling2(n,2*k)/k!.
%o A357084 (PARI) a(n) = sum(k=0, n\2, (2*k)!*(n+k+1)^(k-1)*stirling(n, 2*k, 2)/k!);
%Y A357084 Cf. A349557, A357085.
%Y A357084 Cf. A357024.
%K A357084 nonn
%O A357084 0,3
%A A357084 _Seiichi Manyama_, Sep 11 2022