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 A360898 #12 Feb 26 2023 06:56:10
%S A360898 1,1,1,1,0,-2,-5,-8,-5,13,57,117,110,-179,-1089,-2591,-2852,4370,
%T A360898 30383,77884,88638,-165233,-1133248,-2963659,-3172087,8519500,
%U A360898 53092522,135857134,122296383,-543728791,-2983007603,-7219203443,-4427302115,40439842811,194091075002
%N A360898 G.f. satisfies A(x) = 1 + x/(1 + x^3) * A(x/(1 + x^3)).
%H A360898 Seiichi Manyama, <a href="/A360898/b360898.txt">Table of n, a(n) for n = 0..1000</a>
%F A360898 a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/3)} (-1)^k * binomial(n-1-2*k,k) * a(n-1-3*k).
%o A360898 (PARI) a_vector(n) = my(v=vector(n+1)); v[1]=1; for(i=1, n, v[i+1]=sum(j=0, (i-1)\3, (-1)^j*binomial(i-1-2*j, j)*v[i-3*j])); v;
%Y A360898 Cf. A172385, A360899.
%Y A360898 Cf. A360890.
%K A360898 sign
%O A360898 0,6
%A A360898 _Seiichi Manyama_, Feb 25 2023