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 A059507 #21 Sep 10 2017 17:54:38
%S A059507 4,9,24,66,182,501,1376,3771,10314,28158,76744,208839,567484,1539981,
%T A059507 4173852,11299386,30556346,82547961,222790424,600753663,1618558734,
%U A059507 4357256694,11721125644,31507528971,84637773172
%N A059507 Transform of A059502 applied to sequence 4,5,6,...
%C A059507 The fourth row of the array A059503.
%H A059507 G. C. Greubel, <a href="/A059507/b059507.txt">Table of n, a(n) for n = 1..1000</a>
%H A059507 <a href="/index/Bo#boustrophedon">Index entries for sequences related to boustrophedon transform</a>
%H A059507 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (6,-11,6,-1).
%F A059507 From _Colin Barker_, Nov 30 2012: (Start)
%F A059507 a(n) = 6*a(n-1) - 11*a(n-2) + 6*a(n-3) - a(n-4).
%F A059507 G.f.: x*(1-x)*(3*x^2-11*x+4)/(x^2-3*x+1)^2. (End)
%F A059507 a(n) = ((3 - n)*Fibonacci(2*n) + (15 + 3*n)*Fibonacci(2*n - 1))/5. - _G. C. Greubel_, Sep 10 2017
%t A059507 Rest[CoefficientList[Series[x*(1 - x)*(3*x^2 - 11*x + 4)/(x^2 - 3*x + 1)^2, {x, 0, 50}], x]] (* _G. C. Greubel_, Sep 10 2017 *)
%o A059507 (PARI) Vec(x*(1-x)*(3*x^2-11*x+4)/(x^2-3*x+1)^2 + O(x^40)) \\ _Michel Marcus_, Sep 09 2017
%Y A059507 Cf. A000667, A059216, A059219, A059502.
%K A059507 easy,nonn
%O A059507 1,1
%A A059507 _Floor van Lamoen_, Jan 19 2001