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 A030428 #22 Apr 01 2020 01:02:03
%S A030428 0,0,1,11,287,34559,24883199,125411327999,5056584744959999,
%T A030428 1834933472251084799999,6658606584104736522239999999,
%U A030428 265790267296391946810949631999999999,127313963299399416749559771247411199999999999
%N A030428 a(n) = 0! * 1! * 2! * ... * n! - 1.
%F A030428 a(n) = A000178(n) - 1. - _Sean A. Irvine_, Mar 31 2020
%t A030428 Table[BarnesG[n] - 1, {n, 2, 12}] (* _Zerinvary Lajos_, Jul 16 2009 *)
%t A030428 FoldList[Times,1,Range[10]!]-1 (* _Harvey P. Dale_, Feb 05 2012 *)
%Y A030428 Cf. A019515, A000178.
%K A030428 nice,nonn
%O A030428 0,4
%A A030428 _Felice Russo_
%E A030428 Name corrected by _Arkadiusz Wesolowski_, Oct 03 2011
%E A030428 More terms from _Harvey P. Dale_, Feb 05 2012