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 A066143 #12 Sep 14 2021 19:58:41
%S A066143 1,3,8,18,44,150,762,5096,40392,362970,3628910,39916932,479001756,
%T A066143 6227020982,87178291410,1307674368240,20922789888272,355687428096306,
%U A066143 6402373705728342,121645100408832380,2432902008176640420,51090942171709440462,1124000727777607680506
%N A066143 a(n) = n! + n^2 + n.
%H A066143 Harry J. Smith, <a href="/A066143/b066143.txt">Table of n, a(n) for n = 0..100</a>
%t A066143 Table[n!+n^2+n,{n,0,30}] (* _Harvey P. Dale_, Sep 14 2021 *)
%o A066143 (PARI) { for (n=0, 100, write("b066143.txt", n, " ", n! + n^2 + n) ) } \\ _Harry J. Smith_, Feb 02 2010
%K A066143 easy,nonn
%O A066143 0,2
%A A066143 _George E. Antoniou_, Dec 07 2001