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 A139176 #13 Sep 08 2022 08:45:33
%S A139176 0,3,19,119,839,6719,60479,604799,6652799,79833599,1037836799,
%T A139176 14529715199,217945727999,3487131647999,59281238015999,
%U A139176 1067062284287999,20274183401471999,405483668029439999
%N A139176 a(n) = (n! - 6)/6.
%C A139176 Original name: Natural numbers of the form (n!-6)/6.
%H A139176 Vincenzo Librandi, <a href="/A139176/b139176.txt">Table of n, a(n) for n = 3..300</a>
%p A139176 seq((factorial(n)-6)/6,n=3..25); # _Muniru A Asiru_, Oct 20 2018
%t A139176 Table[(n! - 6)/6, {n, 3, 20}]
%o A139176 (Magma) [(Factorial(n)-6)/6: n in [3..25]]; // _Vincenzo Librandi_, Jul 20 2011
%o A139176 (GAP) List([3..25],n->(Factorial(n)-6)/6); # _Muniru A Asiru_, Oct 20 2018
%Y A139176 Cf. A033312, A139172, A139173, A139174, A139175, A139176, A139177, A139183, A139184.
%K A139176 nonn
%O A139176 3,2
%A A139176 _Artur Jasinski_, Apr 11 2008
%E A139176 New name from _Jon E. Schoenfield_, Oct 19 2018