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 A355767 #11 Jul 16 2022 11:50:15
%S A355767 1,1,0,6,-4,300,-828,42224,-266992,11916864,-132472320,5688511488,
%T A355767 -95465876064,4138883728512,-95019458907072,4276023328128000,
%U A355767 -125481256750340352,5958015717717504000,-212934915549001078272,10767675634298110255104
%N A355767 E.g.f. satisfies A(x)^(A(x)^2) = 1/(1 - x*A(x)).
%F A355767 a(n) = Sum_{k=0..n} (n-2*k+1)^(k-1) * |Stirling1(n,k)|.
%o A355767 (PARI) a(n) = sum(k=0, n, (n-2*k+1)^(k-1)*abs(stirling(n, k, 1)));
%Y A355767 Cf. A001761, A141209.
%Y A355767 Cf. A355768.
%K A355767 sign
%O A355767 0,4
%A A355767 _Seiichi Manyama_, Jul 16 2022