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 A010851 #33 Aug 19 2018 02:31:12
%S A010851 12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,
%T A010851 12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,
%U A010851 12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12
%N A010851 Constant sequence: a(n) = 12.
%H A010851 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>
%H A010851 <a href="/index/Di#divseq">Index to divisibility sequences</a>
%H A010851 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).
%F A010851 G.f.: 12/(1-x). - _Vincenzo Librandi_, Jan 19 2012
%t A010851 Table[12,{60}] (* _Vincenzo Librandi_, Jan 19 2012 *)
%Y A010851 Cf. A142069.
%K A010851 nonn,easy
%O A010851 0,1
%A A010851 _N. J. A. Sloane_