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 A364621 #7 Jul 30 2023 09:22:00
%S A364621 1,3,15,118,1125,11805,131431,1524090,18208749,222570985,2770129627,
%T A364621 34985756752,447243818573,5775955923428,75245253495035,
%U A364621 987627627396792,13048147674230169,173382031819242855,2315662483861709467,31068798980975635130,418552735866147739185
%N A364621 G.f. satisfies A(x) = 1/(1-x)^2 + x*A(x)^4.
%F A364621 a(n) = Sum_{k=0..n} binomial(n+5*k+1,6*k+1) * binomial(4*k,k) / (3*k+1).
%o A364621 (PARI) a(n) = sum(k=0, n, binomial(n+5*k+1, 6*k+1)*binomial(4*k, k)/(3*k+1));
%Y A364621 Cf. A086616, A364620.
%K A364621 nonn
%O A364621 0,2
%A A364621 _Seiichi Manyama_, Jul 30 2023