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 A013891 #20 Sep 08 2022 08:44:38 %S A013891 361,893871739,2213314919066161,5480386857784802185939, %T A013891 13569980418174090907801371961,33600614943460448322716069311260139, %U A013891 83198449060887472631428936505541918917761,206007596521214410095208558252435839890349094339 %N A013891 a(n) = 19^(5*n + 2). %H A013891 Vincenzo Librandi, <a href="/A013891/b013891.txt">Table of n, a(n) for n = 0..50</a> %H A013891 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A013891 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (2476099). %F A013891 a(n) = 2476099*a(n-1), a(0)=361. - _Vincenzo Librandi_, May 27 2011 %t A013891 19^(5*Range[0,20]+2) (* _Harvey P. Dale_, Apr 27 2012 *) %o A013891 (Magma) [19^(5*n+2): n in [0..10]]; // _Vincenzo Librandi_, May 27 2011 %Y A013891 Cf. A001029. %K A013891 nonn %O A013891 0,1 %A A013891 _N. J. A. Sloane_