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 A046032 #19 Feb 16 2025 08:32:38
%S A046032 0,3,35,575,14399,518399,25401599,1625702399,131681894399,
%T A046032 13168189439999,1593350922239999,229442532802559999,
%U A046032 38775788043632639999,7600054456551997439999,1710012252724199423999999,437763136697395052543999999,126513546505547170185215999999
%N A046032 a(n) = (n!)^2 - 1.
%H A046032 Vincenzo Librandi, <a href="/A046032/b046032.txt">Table of n, a(n) for n = 1..100</a>
%H A046032 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Factorial.html">Factorial</a>
%t A046032 Table[(n!)^2-1,{n,30}] (* _Vladimir Joseph Stephan Orlovsky_, May 19 2011 *)
%o A046032 (PARI) a(n)=n!^2-1 \\ _Charles R Greathouse IV_, Sep 19 2012
%o A046032 (Magma) [Factorial(n)^2-1: n in [1..15]]; // _Vincenzo Librandi_, Jun 03 2013
%Y A046032 Cf. A001044.
%K A046032 nonn,easy
%O A046032 1,2
%A A046032 _Eric W. Weisstein_