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 A120354 #38 Aug 16 2024 20:39:54 %S A120354 11,33,99,297,891,2673,8019,24057,72171,216513,649539,1948617,5845851, %T A120354 17537553,52612659,157837977,473513931,1420541793,4261625379, %U A120354 12784876137,38354628411,115063885233,345191655699,1035574967097,3106724901291,9320174703873 %N A120354 a(n) = 11*3^n. %C A120354 Square root of A120353. %H A120354 Vincenzo Librandi, <a href="/A120354/b120354.txt">Table of n, a(n) for n = 0..300</a> %H A120354 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A120354 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (3). %F A120354 From _Philippe Deléham_, Nov 23 2008: (Start) %F A120354 a(n) = 3*a(n-1), n > 0; a(0)=11. %F A120354 G.f.: 11/(1-3*x). (End) %F A120354 a(n) = 11*A000244(n). - _Michel Marcus_, Sep 04 2013 %F A120354 E.g.f.: 11*exp(3*x). - _Elmo R. Oliveira_, Aug 16 2024 %t A120354 11*3^Range[0, 60] (* _Vladimir Joseph Stephan Orlovsky_, Jun 09 2011 *) %t A120354 NestList[3#&,11,30] (* _Harvey P. Dale_, Mar 04 2013 *) %o A120354 (Magma) [11*3^n: n in [0..30]]; // _Vincenzo Librandi_, Jun 10 2011 %o A120354 (PARI) a(n)=11*3^n \\ _Charles R Greathouse IV_, Sep 04 2013 %Y A120354 Cf. A000244, A120353. %K A120354 nonn,easy %O A120354 0,1 %A A120354 _Anton Joha_, Jun 25 2006 %E A120354 Better definition from _Tanya Khovanova_, Jan 20 2007