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 A103956 #12 Dec 18 2022 07:06:50
%S A103956 1,1,1,2,1,1,2,1,1,2,1,2,1,2,1,3,1,1,2,1,2,1,2,1,3,1,1,2,1,2,1,2,1,3,
%T A103956 1,2,1,2,1,3,1,2,1,3,1,2,1,3,1,2,1,1,1,2,1,2,1,2,1,3,1,2,1,2,1,3,1,2,
%U A103956 1,3,1,2,1,3,1,2,1,1,2,1,2,1,3,1,2,1,3,1,2,1,3,1,2,1,1,2,1,3,1,2,1,3,1,2,1
%N A103956 A nonsense sequence.
%F A103956 1-> {1, 2} 2->{1, 3} 3->1 nested nest of substitution list are taken in a chaotic order.
%t A103956 Conway[1] = Conway[2] = 1;
%t A103956 Conway[n_Integer?Positive] := Conway[n] = Conway[Conway[n - 1]] + Conway[n - Conway[n - 1]]
%t A103956 s[1] = {1, 2}; s[2] = {1, 3}; s[3] = {1};
%t A103956 t[a_] := Join[a, Flatten[s /@ a]];
%t A103956 p[0] = {1}; p[1] = t[{1}];
%t A103956 p[n_] := t[p[n - 1]]
%t A103956 aa = Flatten[Table[p[If[n > 0, Conway[n], n]], {n, 0, 7}]]
%Y A103956 Cf. A073058, A103684.
%K A103956 nonn,uned,less
%O A103956 0,4
%A A103956 _Roger L. Bagula_, Mar 30 2005