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 A010857 #25 Dec 27 2021 21:49:12
%S A010857 18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,
%T A010857 18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,
%U A010857 18,18,18,18,18,18,18,18
%N A010857 Constant sequence: a(n) = 18.
%H A010857 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>
%H A010857 <a href="/index/Di#divseq">Index to divisibility sequences</a>
%H A010857 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).
%F A010857 G.f.: 18/(1-x); e.g.f.: 18*e^x. - _Vincenzo Librandi_, Jan 20 2012
%t A010857 Table[18,{80}] (* _Vincenzo Librandi_, Jan 20 2012 *)
%K A010857 nonn,easy
%O A010857 0,1
%A A010857 _N. J. A. Sloane_