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 A384787 #12 Jun 10 2025 12:52:21 %S A384787 1,1,7,148,7381,801536,186678019,93865986880,102755888482153, %T A384787 245872091164966912,1285664593514044479391,14650473009515606022910976, %U A384787 362327823926201727094352145661,19359048028300511200690402408529920,2224311455921555052696103713299884826395 %N A384787 E.g.f. A(x) satisfies A(x) = exp( x*A(x) * A(2*x*A(x)) ). %F A384787 See A384788. %o A384787 (PARI) a(n, k=1) = if(k==0, 0^n, k*sum(j=0, n, 2^(n-j)*(n+k)^(j-1)*binomial(n, j)*a(n-j, j))); %Y A384787 Column k=1 of A384788. %Y A384787 Cf. A140049. %K A384787 nonn %O A384787 0,3 %A A384787 _Seiichi Manyama_, Jun 10 2025