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 A088353 #6 Jul 01 2019 10:35:42
%S A088353 1,1,2,4,7,13,24,45,84,157,293,548,1025,1917,3585,6705,12542,23460,
%T A088353 43882,82081,153535,287193,537205,1004861,1879631,3515926,6576683,
%U A088353 12301953,23011306,43043596,80514826,150606312
%N A088353 G.f. = continued fraction: A(x)=1/(1-x-x^2-x^3/(1-x^4-x^5-x^6/(1-x^7-x^8-x^9/(...)))).
%F A088353 a(n) ~ c * d^n, where d = 1.870541465383068095221362846114209693931261586115556... and c = 0.55828451809888511309633311209777966847218631317600288... - _Vaclav Kotesovec_, Jul 01 2019
%t A088353 nmax = 40; CoefficientList[Series[1/(1 - x - x^2 + ContinuedFractionK[-x^(3*k), 1 - x^(3*k + 1) - x^(3*k + 2), {k, 1, nmax}]), {x, 0, nmax}], x] (* _Vaclav Kotesovec_, Jul 01 2019 *)
%K A088353 nonn
%O A088353 0,3
%A A088353 _Paul D. Hanna_, Sep 26 2003