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 A113438 #13 Jun 13 2015 00:51:54
%S A113438 1,4,16,62,237,901,3418,12956,49096,186029,704861,2670692,10119152,
%T A113438 38341126,145273353,550436561,2085588866,7902239404,29941371656,
%U A113438 113447051497,429847830217,1628681887876,6171031956688,23381874459566,88593294803061,335677616363629
%N A113438 Third row of A113435.
%H A113438 Colin Barker, <a href="/A113438/b113438.txt">Table of n, a(n) for n = 0..1000</a>
%H A113438 <a href="/index/Rec#order_04">Index entries for linear recurrences with constant coefficients</a>, signature (7,-15,11,-1).
%F A113438 a(n) = 7*a(n-1)-15*a(n-2)+11*a(n-3)-a(n-4), n>4.
%F A113438 a(n) = A113435(3n+2).
%F A113438 G.f.: (1-x)^3 / (x^4-11*x^3+15*x^2-7*x+1).
%t A113438 CoefficientList[Series[(1 - x)^3/(x^4 - 11*x^3 + 15*x^2 - 7*x + 1), {x, 0, 30}], x] (* _Wesley Ivan Hurt_, May 28 2015 *)
%o A113438 (PARI) Vec(-(x-1)^3 / (x^4-11*x^3+15*x^2-7*x+1) + O(x^100)) \\ _Colin Barker_, May 28 2015
%Y A113438 Cf. A113435.
%K A113438 nonn,easy
%O A113438 0,2
%A A113438 _Floor van Lamoen_, Nov 04 2005
%E A113438 Error in recursion and strange things in formula fixed by _Colin Barker_, May 28 2015