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