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 A121200 #25 Sep 15 2024 01:37:24
%S A121200 2,14,78,474,3034,19942,133286,901682,6155442,42306750,292240894,
%T A121200 2026154890,14085427850,98109713558,684326588502,4778079088098,
%U A121200 33385518460258,233393453440366,1632228295176110,11417968671701306
%N A121200 a(n) = 2*n + 7^n + 5^n.
%H A121200 Vincenzo Librandi, <a href="/A121200/b121200.txt">Table of n, a(n) for n = 0..1000</a>
%F A121200 G.f.: 2*(1-7*x+x^2+29*x^3)/((1-x)^2*(1-5*x)*(1-7*x)). - _Vincenzo Librandi_, Feb 25 2013
%t A121200 Table[2 n + 7^n + 5^n, {n, 0, 20}] (* _Harvey P. Dale_, Mar 30 2011 *)
%t A121200 CoefficientList[Series[2 (1 - 7 x + x^2 + 29 x^3)/((1 - x)^2 (1 - 5 x)(1 - 7 x)), {x, 0, 30}], x] (* _Vincenzo Librandi_, Feb 25 2013 *)
%o A121200 (Magma) [2*n+7^n+5^n: n in [0..30]]; // _Vincenzo Librandi_, Feb 25 2013
%Y A121200 Cf. A074616.
%K A121200 nonn,easy
%O A121200 0,1
%A A121200 _Mohammad K. Azarian_, Aug 19 2006
%E A121200 Edited by _Ray Chandler_, Sep 06 2006