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 A138829 #6 Feb 22 2017 02:24:19
%S A138829 1,3,5,8,10,12,14,16,18,20,22,24,26,29,31,33,35,37,39,41,43,45,47,49,
%T A138829 51,53,55,57,59,61,63,65,67,69,71,73,75,77,79,81,83,85,87,89,91,93,95,
%U A138829 97,99,101,103,105,107,109,111,113,115,117
%N A138829 Bisection of imperfect numbers A132999.
%H A138829 G. C. Greubel, <a href="/A138829/b138829.txt">Table of n, a(n) for n = 1..1000</a>
%F A138829 G.f.: (-x^14 + x^13 - x^4 + x^3 + x + 1)/(x^2 - 2*x + 1). - _Alexander R. Povolotsky_, Apr 06 2008
%t A138829 CoefficientList[Series[(-x^14 + x^13 - x^4 + x^3 + x + 1)/(x^2 - 2*x + 1), {x, 0, 50}], x] (* _G. C. Greubel_, Feb 21 2017 *)
%o A138829 (PARI) x='x+O('x^50); Vec((-x^14 + x^13 - x^4 + x^3 + x + 1)/(x^2 - 2*x + 1)) \\ _G. C. Greubel_, Feb 21 2017
%Y A138829 Cf. A000396, A099057, A099058, A132999.
%K A138829 easy,nonn
%O A138829 1,2
%A A138829 _Omar E. Pol_, Apr 06 2008