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 A128987 #18 Sep 08 2022 08:45:30
%S A128987 0,64,1152,12288,102400,737280,4816896,29360128,169869312,943718400,
%T A128987 5075107840,26575110144,136096776192,683973541888,3382286745600,
%U A128987 16492674416640,79439715106816,378506877861888,1786156639322112
%N A128987 a(n) = (n^3 - n^2)*4^n.
%H A128987 Vincenzo Librandi, <a href="/A128987/b128987.txt">Table of n, a(n) for n = 1..1000</a>
%H A128987 <a href="/index/Rec">Index entries for linear recurrences with constant coefficients</a>, signature (16,-96,256,-256).
%F A128987 G.f.: 64x^2(1+2x)/(1-4x)^4. - _R. J. Mathar_, Dec 19 2008
%F A128987 a(n) = 16*a(n-1) -96*a(n-2) +256*a(n-3)-256*a(n-4). - _Vincenzo Librandi_, Feb 11 2013
%t A128987 LinearRecurrence[{16, -96, 256, -256}, {0, 64, 1152, 12288}, 30] (* _Vincenzo Librandi_, Feb 11 2013 *)
%o A128987 (Magma) [(n^3 - n^2)*4^n: n in [1..25]]; // _Vincenzo Librandi_, Feb 11 2013
%Y A128987 Cf. A128796, A036289.
%K A128987 nonn,easy
%O A128987 1,2
%A A128987 _Mohammad K. Azarian_, Apr 30 2007
%E A128987 Offset corrected by _Mohammad K. Azarian_, Nov 20 2008