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 A013885 #24 Sep 08 2022 08:44:38 %S A013885 83521,118587876497,168377826559400929,239072435685151324847153, %T A013885 339448671314611904643504117121,481968572106750915091411825223071697, %U A013885 684326450885775034048946719925754910487329,971645701575323882519635342913622589939807491953 %N A013885 a(n) = 17^(5*n + 4). %H A013885 Vincenzo Librandi, <a href="/A013885/b013885.txt">Table of n, a(n) for n = 0..50</a> %H A013885 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A013885 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1419857). %F A013885 a(n) = 1419857*a(n-1). - _Harvey P. Dale_, May 26 2011 %t A013885 17^(5*Range[0,20]+4) (* or *) NestList[1419857#&,83521,20] (* _Harvey P. Dale_, May 26 2011 *) %o A013885 (Magma) [17^(5*n+4): n in [0..10]]; // _Vincenzo Librandi_, May 27 2011 %Y A013885 Cf. A001026. %K A013885 nonn %O A013885 0,1 %A A013885 _N. J. A. Sloane_