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 A384720 #8 Jun 08 2025 10:50:08 %S A384720 1,1,7,118,3385,141556,7918489,561302470,48589734337,5001284972872, %T A384720 599865865782481,82534986682048066,12863925185682542833, %U A384720 2248009460254706256460,436716594440553989797369,93635975845903995553159126,22021353830468757164023479169,5650417076648052544704264390160 %N A384720 E.g.f. A(x) satisfies A(x) = exp( x * A(x*A(x))^3 ). %F A384720 See A384722. %o A384720 (PARI) a(n, k=1) = if(k==0, 0^n, k*sum(j=0, n, (n-j+k)^(j-1)*binomial(n, j)*a(n-j, 3*j))); %Y A384720 Column k=1 of A384722. %Y A384720 Cf. A162659, A384719. %K A384720 nonn %O A384720 0,3 %A A384720 _Seiichi Manyama_, Jun 08 2025