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 A129007 #15 Sep 08 2022 08:45:30
%S A129007 14,588,12348,192080,2521050,29647548,322828856,3320525376,
%T A129007 32686421670,310722773900,2871078430836,25910889640272,
%U A129007 229239398622962,1993975834176060,17091221435794800,144629713838903552
%N A129007 (n^3+n^2)*7^n.
%H A129007 Harvey P. Dale, <a href="/A129007/b129007.txt">Table of n, a(n) for n = 1..1000</a>
%H A129007 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (28,-294,1372,-2401).
%F A129007 a(1)=14, a(2)=588, a(3)=12348, a(4)=192080, a(n)=28*a(n-1)-294*a(n-2)+ 1372*a(n-3)-2401*a(n-4). - _Harvey P. Dale_, Nov 21 2012
%F A129007 G.f.: 14*x*(1+14*x)/(1-7*x)^4. - _Vincenzo Librandi_, Feb 12 2013
%t A129007 Table[(n^3+n^2)7^n,{n,30}] (* or *) LinearRecurrence[{28,-294,1372,-2401},{14,588,12348,192080},30] (* _Harvey P. Dale_, Nov 21 2012 *)
%t A129007 CoefficientList[Series[14 (1 + 14 x)/(1 - 7 x)^4, {x, 0, 30}], x] (* _Vincenzo Librandi_, Feb 12 2013 *)
%o A129007 (Magma) [(n^3+n^2)*7^n: n in [1..25]]; // _Vincenzo Librandi_, Feb 12 2013
%Y A129007 Cf. A128796, A036289.
%K A129007 nonn,easy
%O A129007 1,1
%A A129007 _Mohammad K. Azarian_, May 01 2007