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 A386467 #10 Jul 23 2025 09:07:03
%S A386467 1,1,3,11,56,353,2619,22175,210077,2196732,25104008,311139385,
%T A386467 4156661566,59551385285,910955221547,14821776943015,255639834413712,
%U A386467 4659720389150655,89515541970546889,1807824383345511646,38294715773270374886,849051935815301595992,19665430140710069083996
%N A386467 a(0) = a(1) = 1; a(n) = a(n-1) + a(n-2) + Sum_{k=0..n-1} k * a(k) * a(n-1-k).
%F A386467 G.f. A(x) satisfies A(x) = 1/( 1 - x - x^2 - x^2 * (d/dx A(x)) ).
%o A386467 (PARI) a_vector(n) = my(v=vector(n+1, i, if(i<=2, 1, 0))); for(i=2, n, v[i+1]=v[i]+v[i-1]+sum(j=0, i-1, j*v[j+1]*v[i-j])); v;
%Y A386467 Cf. A075834, A385287.
%Y A386467 Cf. A307733.
%K A386467 nonn
%O A386467 0,3
%A A386467 _Seiichi Manyama_, Jul 22 2025