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 A079286 #19 Jun 03 2025 03:27:44
%S A079286 0,4,362856,10888869450418352160767959680
%N A079286 a(n) = (3^n)! - (2^n)!.
%C A079286 Sum_{n>0} 1/a(n) = 0.25000275591...
%C A079286 The next term is too large to include.
%C A079286 The next term (a(4)) has 121 digits. - _Harvey P. Dale_, Jan 10 2024
%H A079286 Amiram Eldar, <a href="/A079286/b079286.txt">Table of n, a(n) for n = 0..5</a>
%F A079286 a(n) = A079288(n) - A000722(n). - _Michel Marcus_, Jul 08 2024
%t A079286 Table[(3^n)!-(2^n)!,{n,0,4}] (* _Harvey P. Dale_, Jan 10 2024 *)
%o A079286 (PARI) atonfact(n) = {for(x=0, n, y = (3^x)!-(2^x)!; print1(y, ", "));}
%Y A079286 Cf. A000722, A079288.
%K A079286 easy,nonn
%O A079286 0,2
%A A079286 _Cino Hilliard_, Feb 08 2003