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 A115238 #7 Feb 07 2016 21:33:31
%S A115238 1,3,9,19,38,65,108,165,247,350,489,658,876,1134,1456,1830,2285,2805,
%T A115238 3425,4125,4946,5863,6924,8099,9443,10920,12593,14420,16472,18700,
%U A115238 21184,23868,26841,30039,33561,37335,41470,45885,50700,55825,61391
%N A115238 Row sums of triangle A115237.
%H A115238 G. C. Greubel, <a href="/A115238/b115238.txt">Table of n, a(n) for n = 0..10000</a>
%F A115238 G.f.: (1+x+2*x^2+2*x^3+x^4)/((1-x)^2*(1-x^2)^2*(1-x^4)). - corrected by _G. C. Greubel_, Feb 06 2016
%t A115238 f := Series[(1 + x + 2*x^2 + 2*x^3 + x^4)/((1 - x)^2*(1 - x^2)^2*(1 - x^4)), {x, 0, 100}]; CoefficientList[f, x] (* _G. C. Greubel_, Feb 06 2016 *)
%K A115238 nonn,easy
%O A115238 0,2
%A A115238 _Christian G. Bower_, Jan 17 2006