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 A038123 #14 Mar 27 2015 23:12:06
%S A038123 4,9,14,18,23,28,32,37,42,46,51,56,60,65,70,74,79,84,88,93,98,102,107,
%T A038123 112,116,121,126,130,135,140,144,149,154,158,163,168,172,177,182,186,
%U A038123 191,196,200,205,210,214,219,224,228,233,238,242,247,252,256,261,266
%N A038123 Beatty sequence for Feigenbaum's constant.
%H A038123 <a href="/index/Be#Beatty">Index entries for sequences related to Beatty sequences</a>
%F A038123 a(n)=floor(n*4.6692016609..)
%t A038123 a = 4.6692016091029906718532038204662; Table[ Floor[n*a], {n, 60}] (* _Robert G. Wilson v_, Apr 23 2004 *)
%Y A038123 Cf. A006890.
%K A038123 nonn
%O A038123 1,1
%A A038123 _Felice Russo_
%E A038123 More terms from _Robert G. Wilson v_, Apr 23 2004