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 A173858 #18 Jul 28 2016 21:56:35
%S A173858 1,0,0,1,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,1,0,0,0,0,
%T A173858 0,1,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1,
%U A173858 0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,1,0,0,0,0,0,1,0,1,0,0,0
%N A173858 Expansion of 4/3 in base phi.
%H A173858 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (0,1,0,-1,0,1).
%F A173858 G.f.: x*(1-x^2+x^3+x^4-x^6)/(1-x^2+x^4-x^6). [_Bruno Berselli_, Apr 06 2012]
%F A173858 a(n) = A000475(n)(mod 2) for n > 3. - _John M. Campbell_, Jul 14 2016
%t A173858 RealDigits[ 4/3, GoldenRatio, 111][[1]] (* or *)
%t A173858 LinearRecurrence[{0,1,0,-1,0,1},{1,0,0,1,0,1,0},110] (* _Harvey P. Dale_, Jun 16 2016 *)
%K A173858 nonn,base,easy
%O A173858 1,1
%A A173858 _Robert G. Wilson v_, Feb 26 2010