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 A367925 #14 Dec 05 2023 09:01:09
%S A367925 1,4,35,459,8025,175383,4599507,140728437,4920898317,193579534155,
%T A367925 8461200381111,406815231899409,21337866382711521,1212458502624643719,
%U A367925 74193773349948903483,4864422156647044661949,340191752483516373189621,25278147388666498256368323
%N A367925 Expansion of e.g.f. 1/(4 - x - 3*exp(x)).
%F A367925 a(0) = 1; a(n) = n * a(n-1) + 3 * Sum_{k=1..n} binomial(n,k) * a(n-k).
%o A367925 (PARI) a_vector(n) = my(v=vector(n+1)); v[1]=1; for(i=1, n, v[i+1]=i*v[i]+3*sum(j=1, i, binomial(i, j)*v[i-j+1])); v;
%Y A367925 Cf. A006155, A367924.
%Y A367925 Cf. A032033, A078940, A367831, A367836, A367923.
%K A367925 nonn
%O A367925 0,2
%A A367925 _Seiichi Manyama_, Dec 05 2023