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 A013889 #17 Sep 08 2022 08:44:38 %S A013889 104976,198359290368,374813367582081024,708235345355337676357632, %T A013889 1338258845052394702439737982976, %U A013889 2528731089327963353099650821015994368,4778209346999261057189801002565550445953024,9028751479390699717312017900815782025058563653632 %N A013889 a(n) = 18^(5*n + 4). %H A013889 Vincenzo Librandi, <a href="/A013889/b013889.txt">Table of n, a(n) for n = 0..50</a> %H A013889 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A013889 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1889568). %F A013889 a(n) = 1889568*a(n-1), a(0)=104976. - _Vincenzo Librandi_, May 27 2011 %o A013889 (Magma) [18^(5*n+4): n in [0..10]]; // _Vincenzo Librandi_, May 27 2011 %Y A013889 Cf. A001027. %K A013889 nonn %O A013889 0,1 %A A013889 _N. J. A. Sloane_