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 A135971 #11 Jun 22 2013 16:06:09
%S A135971 13,51,114,202,315,453,616,805,1018,1257,1521,1810,2124,2464,2828,
%T A135971 3217,3632,4072,4537,5027,5542,6083,6648,7239,7854,8495,9161,9853,
%U A135971 10569,11310,12077,12868,13685,14527,15394,16287,17204,18146,19114,20107
%N A135971 Ceiling(4*Pi*n^2).
%C A135971 The original definition was "a(n)=ceiling[surface area of a shpere of radius n]".
%H A135971 Vincenzo Librandi, <a href="/A135971/b135971.txt">Table of n, a(n) for n = 1..1000</a>
%t A135971 Table[Ceiling[4 Pi n^2], {n, 1, 50}] (* _Vincenzo Librandi_, Feb 19 2013 *)
%Y A135971 Cf. A066643, A066644, A066645, A135039.
%K A135971 nonn,easy
%O A135971 1,1
%A A135971 _Mohammad K. Azarian_, Mar 02 2008
%E A135971 Definition replaced by _Bruno Berselli_, Feb 19 2013