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 A010867 #21 Aug 18 2018 21:40:01 %S A010867 28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28, %T A010867 28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28, %U A010867 28,28,28,28,28,28,28,28 %N A010867 Constant sequence: a(n) = 28. %H A010867 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A010867 <a href="/index/Di#divseq">Index to divisibility sequences</a> %H A010867 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1). %F A010867 G.f.: 28/(1-x); e.g.f.: 28*e^x. - _Vincenzo Librandi_, Jan 24 2012 %K A010867 nonn,easy %O A010867 0,1 %A A010867 _N. J. A. Sloane_