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 A357031 #14 Sep 12 2022 05:21:40
%S A357031 1,0,1,3,22,195,2131,28623,445789,7982355,161208976,3626200743,
%T A357031 89942239861,2438520508515,71754865476841,2277574224716703,
%U A357031 77570723071721938,2821841221403098995,109200125293424385271,4479379126010806153143,194148151869063307919725
%N A357031 E.g.f. satisfies log(A(x)) = (exp(x * A(x)) - 1)^2 / 2.
%F A357031 a(n) = Sum_{k=0..floor(n/2)} (2*k)! * (n+1)^(k-1) * Stirling2(n,2*k)/(2^k * k!).
%t A357031 m = 21; (* number of terms *)
%t A357031 A[_] = 0;
%t A357031 Do[A[x_] = Exp[(Exp[x*A[x]] - 1)^2/2] + O[x]^m // Normal, {m}];
%t A357031 CoefficientList[A[x], x]*Range[0, m - 1]! (* _Jean-François Alcover_, Sep 12 2022 *)
%o A357031 (PARI) a(n) = sum(k=0, n\2, (2*k)!*(n+1)^(k-1)*stirling(n, 2*k, 2)/(2^k*k!));
%Y A357031 Cf. A030019, A357032.
%Y A357031 Cf. A060311, A357024.
%K A357031 nonn
%O A357031 0,4
%A A357031 _Seiichi Manyama_, Sep 09 2022