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 A095197 #10 Jul 21 2020 19:50:21 %S A095197 1,2,4,8,16,122,442,488,1768,17342,48742,49568,173188,1762742,4945342, %T A095197 4870988,17781568,173037542,491460742,494128388,1767642988, %U A095197 17784935342,48707897542,49159741568,173029590388,1766191840742,4940963833342 %N A095197 a(1) = 1, a(n+1) = 2 * digit reversal of a(n). %H A095197 Harvey P. Dale, <a href="/A095197/b095197.txt">Table of n, a(n) for n = 1..1000</a> %t A095197 NestList[2*IntegerReverse[#]&,1,30] (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Jul 21 2020 *) %Y A095197 Cf. A095198. %K A095197 base,easy,nonn %O A095197 1,2 %A A095197 _Amarnath Murthy_, Jun 05 2004 %E A095197 Corrected and extended by _Johan Claes_ and _Rick L. Shepherd_, Jun 07 2004