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 A024066 #10 Sep 08 2022 08:44:48
%S A024066 1,5,20,135,1040,7151,45360,277535,1675520,10071135,60456176,
%T A024066 362782415,2176761600,13060665455,78364125680,470184933951,
%U A024066 2821109841920,16926659361215,101559956563440,609359739880175
%N A024066 a(n) = 6^n - n^4.
%H A024066 Vincenzo Librandi, <a href="/A024066/b024066.txt">Table of n, a(n) for n = 0..500</a>
%H A024066 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (11, -40, 70, -65, 31, -6).
%t A024066 Table[6^n-n^4,{n,0,30}] (* or *) LinearRecurrence[{11,-40,70,-65,31,-6},{1,5,20,135,1040,7151},30] (* _Harvey P. Dale_, Apr 09 2018 *)
%o A024066 (Magma) [6^n-n^4: n in [0..25]]; // _Vincenzo Librandi_, Jul 03 2011
%K A024066 nonn,easy
%O A024066 0,2
%A A024066 _N. J. A. Sloane_