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 A066744 #5 Mar 31 2012 20:38:27
%S A066744 1,7,29,117,471,1885,7543,30173,120693,482775,1931101,7724405,
%T A066744 30897623,123590493,494361975,1977447901,7909791605,31639166423,
%U A066744 126556665693,506226662775,2024906651101,8099626604405,32398506417623
%N A066744 a(n) = either 4a(n-1)+1 or 4a(n-1)+3 depending on corresponding term of A005614, +3 for 0, +1 for 1.
%C A066744 Ratio to terms of A028894 tends to 1.23459972586...
%t A066744 f[1]={0}; f[2]={1}; f[n_] := f[n]=Join[f[n-1], f[n-2]]; a[1]=1; a[n_] := a[n]=4a[n-1]+3-2f[9][[n]]; a/@Range[1, 30]
%Y A066744 Related to A005614, A002450, A037576, A028894.
%K A066744 nonn
%O A066744 1,2
%A A066744 _John McNamara_, Jan 16 2002