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 A010858 #21 Aug 18 2018 21:40:42
%S A010858 19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,
%T A010858 19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,
%U A010858 19,19,19,19,19,19,19,19
%N A010858 Constant sequence: a(n) = 19.
%H A010858 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>
%H A010858 <a href="/index/Di#divseq">Index to divisibility sequences</a>
%H A010858 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).
%F A010858 G.f.: 19/(1-x); e.g.f.: 19*e^x. - _Vincenzo Librandi_, Jan 20 2012
%t A010858 Table[19,{80}] (* _Vincenzo Librandi_, Jan 20 2012 *)
%K A010858 nonn,easy
%O A010858 0,1
%A A010858 _N. J. A. Sloane_