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 A364989 #8 Aug 15 2023 11:27:45
%S A364989 1,1,10,207,6628,288885,15969606,1070760523,84448152328,7660906993737,
%T A364989 785932068816010,89973000854464431,11370915080258640204,
%U A364989 1572520778920744136029,236212754707591898128270,38299196311415039667233715,6666717272317556205911393296
%N A364989 E.g.f. satisfies A(x) = 1 + x*A(x)^4*exp(x*A(x)^4).
%F A364989 a(n) = (n!/(4*n+1)) * Sum_{k=0..n} k^(n-k) * binomial(4*n+1,k)/(n-k)!.
%o A364989 (PARI) a(n) = n!*sum(k=0, n, k^(n-k)*binomial(4*n+1, k)/(n-k)!)/(4*n+1);
%Y A364989 Cf. A161633, A364982, A364986.
%K A364989 nonn
%O A364989 0,3
%A A364989 _Seiichi Manyama_, Aug 15 2023