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 A013837 #19 Sep 08 2022 08:44:38 %S A013837 625,1953125,6103515625,19073486328125,59604644775390625, %T A013837 186264514923095703125,582076609134674072265625, %U A013837 1818989403545856475830078125,5684341886080801486968994140625,17763568394002504646778106689453125 %N A013837 a(n) = 5^(5*n + 4). %H A013837 Vincenzo Librandi, <a href="/A013837/b013837.txt">Table of n, a(n) for n = 0..100</a> %H A013837 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A013837 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (3125). %F A013837 From _Philippe Deléham_, Dec 03 2008: (Start) %F A013837 a(n) = 3125*a(n-1), n > 0; a(0)=625. %F A013837 G.f.: 625/(1-3125*x). (End) %o A013837 (Magma) [5^(5*n+4): n in [0..15]]; // _Vincenzo Librandi_, Jul 07 2011 %Y A013837 Cf. A000351 (5^n), A016897 (5*n+4). %K A013837 nonn,easy %O A013837 0,1 %A A013837 _N. J. A. Sloane_