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 A013782 #23 Sep 08 2022 08:44:38 %S A013782 5,3125,1953125,1220703125,762939453125,476837158203125, %T A013782 298023223876953125,186264514923095703125,116415321826934814453125, %U A013782 72759576141834259033203125,45474735088646411895751953125 %N A013782 a(n) = 5^(4*n + 1). %H A013782 Vincenzo Librandi, <a href="/A013782/b013782.txt">Table of n, a(n) for n = 0..200</a> %H A013782 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A013782 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (625). %F A013782 From _Philippe Deléham_, Nov 28 2008: (Start) %F A013782 a(n) = 625*a(n-1); a(0)=5. %F A013782 G.f.: 5/(1-625*x). (End) %t A013782 5^(4*Range[0,10]+1) (* or *) NestList[625#&,5,10] (* _Harvey P. Dale_, Jul 12 2012 *) %o A013782 (Magma) [5^(4*n+1): n in [0..15]]; // _Vincenzo Librandi_, Jun 28 2011 %o A013782 (PARI) a(n)=5^(4*n+1) \\ _Charles R Greathouse IV_, Jul 11 2016 %Y A013782 Subsequence of A000351. %K A013782 nonn,easy %O A013782 0,1 %A A013782 _N. J. A. Sloane_