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 A366328 #14 Oct 07 2023 08:45:43
%S A366328 1,2,-7,60,-612,6898,-82806,1038076,-13431940,178040315,-2405137161,
%T A366328 32992706368,-458336721104,6435090557964,-91167680664004,
%U A366328 1301665779507128,-18710805300530504,270559054510943509,-3932893180646204203,57437414168562779574,-842365843304975785062
%N A366328 G.f. satisfies A(x) = (1 + x) * (1 + x/A(x)^4).
%F A366328 a(n) = (-1)^(n-1) * Sum_{k=0..n} binomial(5*k-1,k) * binomial(n+3*k-2,n-k)/(5*k-1).
%o A366328 (PARI) a(n) = (-1)^(n-1)*sum(k=0, n, binomial(5*k-1, k)*binomial(n+3*k-2, n-k)/(5*k-1));
%Y A366328 Cf. A073157, A364336, A364337, A364338, A364339, A366325, A366326, A366327.
%Y A366328 Cf. A118971, A364408.
%K A366328 sign
%O A366328 0,2
%A A366328 _Seiichi Manyama_, Oct 07 2023