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 A013783 #21 Sep 08 2022 08:44:38 %S A013783 125,78125,48828125,30517578125,19073486328125,11920928955078125, %T A013783 7450580596923828125,4656612873077392578125,2910383045673370361328125, %U A013783 1818989403545856475830078125,1136868377216160297393798828125 %N A013783 a(n) = 5^(4*n + 3). %H A013783 Vincenzo Librandi, <a href="/A013783/b013783.txt">Table of n, a(n) for n = 0..200</a> %H A013783 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A013783 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (625). %F A013783 From _Philippe Deléham_, Nov 30 2008: (Start) %F A013783 a(n) = 625*a(n-1); a(0)=125. %F A013783 G.f.: 125/(1-625*x). %F A013783 a(n) = 25*A013782(n). (End) %t A013783 5^(4*Range[0,20]+3) (* or *) NestList[625#&,125,20] (* _Harvey P. Dale_, Aug 14 2018 *) %o A013783 (Magma) [5^(4*n+3): n in [0..15]]; // _Vincenzo Librandi_, Jun 28 2011 %Y A013783 Subsequence of A000351. %K A013783 nonn,easy %O A013783 0,1 %A A013783 _N. J. A. Sloane_