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 A128051 #11 Sep 08 2022 08:45:30
%S A128051 14,490,10290,163268,2184910,26118078,288240050,2997696520,
%T A128051 29780961966,285300001490,2653572489106,24083839729740,
%U A128051 214124712999470,1870539234917542,16094233518706770,136653810502199312
%N A128051 (n^3+n)*7^n.
%H A128051 Vincenzo Librandi, <a href="/A128051/b128051.txt">Table of n, a(n) for n = 1..1000</a>
%F A128051 G.f.: 14*x*(1 + 7*x + 49*x^2)/(1 - 7*x)^4. - _Vincenzo Librandi_, Feb 22 2013
%t A128051 Table[(n^3 + n) * 7^n, {n, 30}] (* or *) CoefficientList[Series[14 (1 + 7 x + 49 x^2)/(1 - 7 x)^4, {x, 0, 20}], x] (* _Vincenzo Librandi_, Feb 22 2013 *)
%o A128051 (Magma) [(n^3 + n)*7^n: n in [1..20]]; // _Vincenzo Librandi_, Feb 22 2013
%Y A128051 Cf. A128796, A128960, A128985, A129002.
%K A128051 nonn,easy
%O A128051 1,1
%A A128051 _Mohammad K. Azarian_, May 02 2007