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 A128798 #20 Sep 08 2022 08:45:30
%S A128798 0,0,32,384,3072,20480,122880,688128,3670016,18874368,94371840,
%T A128798 461373440,2214592512,10468982784,48855252992,225485783040,
%U A128798 1030792151040,4672924418048,21028159881216,94008244174848,417814418554880
%N A128798 n*(n-1)*4^n.
%H A128798 Vincenzo Librandi, <a href="/A128798/b128798.txt">Table of n, a(n) for n = 0..1000</a>
%H A128798 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (12,-48,64).
%F A128798 G.f.: 32*x^2/(1 - 4*x)^3. - _Vincenzo Librandi_, Feb 10 2013
%F A128798 a(n) =32*A038845(n-2). - _R. J. Mathar_, Apr 26 2015
%t A128798 CoefficientList[Series[32 x^2/(1 - 4 x)^3, {x, 0, 30}], x] (* _Vincenzo Librandi_, Feb 10 2013 *)
%t A128798 LinearRecurrence[{12,-48,64},{0,0,32},30] (* _Harvey P. Dale_, Dec 23 2015 *)
%o A128798 (Magma) [(n^2-n)*4^n: n in [0..20]]; // _Vincenzo Librandi_, Feb 10 2013
%Y A128798 Cf. A036289, A007758.
%K A128798 nonn,easy
%O A128798 0,3
%A A128798 _Mohammad K. Azarian_, Apr 07 2007