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 A384574 #10 Jun 04 2025 09:53:02 %S A384574 1,1,1,5,23,155,1236,11286,116333,1329433,16630343,225606826, %T A384574 3294976854,51496560764,856858516809,15112857079891,281479726839851, %U A384574 5517842789917283,113510479973132860,2444032094604379100,54948814775692303024,1287258966133883349701 %N A384574 G.f. A(x) satisfies A(x) = 1 + x * A(x*A(x)^4). %F A384574 See A384582. %o A384574 (PARI) a(n, k=1) = if(k==0, 0^n, k*sum(j=0, n, binomial(4*n-4*j+k, j)/(4*n-4*j+k)*a(n-j, j))); %Y A384574 Column k=1 of A384582. %Y A384574 Cf. A087949, A143500, A143501, A384575. %Y A384574 Cf. A384578. %K A384574 nonn %O A384574 0,4 %A A384574 _Seiichi Manyama_, Jun 04 2025