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 A364373 #9 Jul 21 2023 11:09:48
%S A364373 1,0,-1,4,-12,26,-14,-236,1604,-6577,17827,-14064,-186496,1437856,
%T A364373 -6416576,18733256,-17358808,-201270728,1652571996,-7692333934,
%U A364373 23375782030,-23913813710,-250917362258,2147925544190,-10270145045142,32053993413694,-35259817590134
%N A364373 G.f. satisfies A(x) = (1 + x) * (1 - x*A(x)^4).
%F A364373 a(n) = Sum_{k=0..n} (-1)^k * binomial(4*k+1,k) * binomial(4*k+1,n-k) / (4*k+1).
%o A364373 (PARI) a(n) = sum(k=0, n, (-1)^k*binomial(4*k+1, k)*binomial(4*k+1, n-k)/(4*k+1));
%Y A364373 Cf. A364371, A364372.
%Y A364373 Cf. A364337.
%K A364373 sign
%O A364373 0,4
%A A364373 _Seiichi Manyama_, Jul 20 2023