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 A024027 #14 Sep 08 2022 08:44:48
%S A024027 1,2,-7,-54,-175,-382,-567,-214,2465,13122,49049,162506,510705,
%T A024027 1565762,4744553,14298282,42981185,129056642,387315513,1162131146,
%U A024027 3486624401,10460158722,31380825353,94142898986,282429204705
%N A024027 a(n) = 3^n - n^4.
%H A024027 Vincenzo Librandi, <a href="/A024027/b024027.txt">Table of n, a(n) for n = 0..200</a>
%F A024027 a(n) = 3^n - n^4.
%t A024027 Table[3^n-n^4,{n,0,60}] (* _Vladimir Joseph Stephan Orlovsky_, Feb 15 2011 *)
%o A024027 (Magma) [3^n-n^4 : n in [0..30]]; // _Vincenzo Librandi_, May 17 2011
%K A024027 sign
%O A024027 0,2
%A A024027 _N. J. A. Sloane_