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 A005055 #37 Apr 09 2024 05:49:34 %S A005055 7,35,175,875,4375,21875,109375,546875,2734375,13671875,68359375, %T A005055 341796875,1708984375,8544921875,42724609375,213623046875, %U A005055 1068115234375,5340576171875,26702880859375,133514404296875,667572021484375,3337860107421875,16689300537109375 %N A005055 a(n) = 7*5^n. %C A005055 a(n) = sum of row n+1 of triangle A249307. - _Reinhard Zumkeller_, Nov 14 2014 %H A005055 Vincenzo Librandi, <a href="/A005055/b005055.txt">Table of n, a(n) for n = 0..1000</a> %H A005055 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A005055 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (5). %F A005055 a(n) = 5*a(n-1), n>0; a(0)=7. G.f.: 7/(1-5*x). - _Philippe Deléham_, Nov 23 2008 %F A005055 E.g.f.: 7*e^(5*x). - _Mohammad K. Azarian_, Jan 15 2009 %t A005055 7*5^Range[0, 100] (* _Vladimir Joseph Stephan Orlovsky_, Jun 09 2011 *) %t A005055 NestList[5#&,7,30] (* _Harvey P. Dale_, Sep 28 2015 *) %o A005055 (Magma) [7*5^n: n in [0..20]]; // _Vincenzo Librandi_, Sep 15 2011 %o A005055 (Haskell) %o A005055 a005055 = (* 7) . (5 ^) %o A005055 a005055_list = iterate (* 5) 7 -- _Reinhard Zumkeller_, Nov 14 2014 %Y A005055 Cf. A000351. %K A005055 nonn,easy %O A005055 0,1 %A A005055 _N. J. A. Sloane_