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 A013728 #24 Sep 08 2022 08:44:38 %S A013728 23,12167,6436343,3404825447,1801152661463,952809757913927, %T A013728 504036361936467383,266635235464391245607,141050039560662968926103, %U A013728 74615470927590710561908487,39471584120695485887249589623 %N A013728 a(n) = 23^(2*n + 1). %H A013728 Vincenzo Librandi, <a href="/A013728/b013728.txt">Table of n, a(n) for n = 0..200</a> %H A013728 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A013728 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (529). %F A013728 From _Philippe Deléham_, Nov 28 2008: (Start) %F A013728 a(n) = 529*a(n-1); a(0)=23. %F A013728 G.f.: 23/(1-529*x). (End) %p A013728 seq(23^(2*n+1),n=0..10); # _Nathaniel Johnston_, Jun 26 2011 %t A013728 NestList[529#&,23,15] (* _Harvey P. Dale_, Jan 17 2012 *) %o A013728 (Magma) [23^(2*n+1): n in [0..15]]; // _Vincenzo Librandi_, Jun 26 2011 %o A013728 (PARI) a(n)=23^(2*n+1) \\ _Charles R Greathouse IV_, Jul 11 2016 %Y A013728 Cf. A013708-A013727, A013729. %K A013728 nonn,easy %O A013728 0,1 %A A013728 _N. J. A. Sloane_