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 A013829 #26 Sep 08 2022 08:44:38 %S A013829 81,19683,4782969,1162261467,282429536481,68630377364883, %T A013829 16677181699666569,4052555153018976267,984770902183611232881, %U A013829 239299329230617529590083,58149737003040059690390169,14130386091738734504764811067 %N A013829 a(n) = 3^(5*n + 4). %H A013829 Vincenzo Librandi, <a href="/A013829/b013829.txt">Table of n, a(n) for n = 0..200</a> %H A013829 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A013829 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (243). %F A013829 From _Philippe Deléham_, Nov 26 2008: (Start) %F A013829 a(n) = 243*a(n-1); a(0)=81. %F A013829 G.f.: 81/(1-243*x). (End) %F A013829 a(n) = A000244(A016897(n)). - _Wesley Ivan Hurt_, Sep 04 2022 %t A013829 NestList[243#&,81,12] (* _Harvey P. Dale_, Jan 23 2016 *) %o A013829 (Magma) [3^(5*n+4): n in [0..15]]; // _Vincenzo Librandi_, Jul 07 2011 %o A013829 (Maxima) makelist(3^(5*n+4),n,0,20); /* _Martin Ettl_, Oct 21 2012 */ %o A013829 (PARI) a(n)=3^(5*n+4) \\ _Charles R Greathouse IV_, Jul 11 2016 %Y A013829 Cf. A000244, A016897. %K A013829 nonn,easy %O A013829 0,1 %A A013829 _N. J. A. Sloane_