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 A119384 #11 Sep 14 2024 06:53:20
%S A119384 9,8,4,76,880,280,4960,59680,637120,6371200,60083200,520998400,
%T A119384 3772979200,12821708800,8692325632000,79077210112000,644312571904000,
%U A119384 3597626294272000,878354899591168000,7567097991823360000,48909057828290560000,8875999272222392320000
%N A119384 Ten's complement of the factorials.
%D A119384 J. Earls & J. Rogers, 0.1361015212836455566..., Lulu Press, NY, 2006, p. 32.
%H A119384 Amazon.com, <a href="http://tinyurl.com/o7qlb">0.1361015212836455566...(Title of split novel)</a>
%F A119384 a(n) = 10^length(n!) - n!.
%t A119384 Table[10^Length[IntegerDigits[n!]]-n!,{n,22}] (* _James C. McMahon_, Sep 13 2024 *)
%Y A119384 Cf. A000142, A110396.
%K A119384 base,easy,nonn
%O A119384 1,1
%A A119384 _Jason Earls_, Jul 24 2006
%E A119384 a(21)-a(22) from _James C. McMahon_, Sep 13 2024