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 A123367 #15 Sep 08 2022 08:45:28
%S A123367 1,11,82,614,5008,45296,453472,4989344,59874688,778376576,10897284352,
%T A123367 163459291904,2615348727808,44460928495616,800296713183232,
%U A123367 15205637551038464,304112751021948928,6386367771463417856,140500090972200435712,3231502092360621031424
%N A123367 a(n) = (n! - 2^n)/8, n >= 4.
%H A123367 G. C. Greubel, <a href="/A123367/b123367.txt">Table of n, a(n) for n = 4..448</a>
%t A123367 Table[(n!-2^n)/8,{n,4,30}] (* _Harvey P. Dale_, Aug 19 2012 *)
%o A123367 (PARI) for(n=4,25, print1((n!-2^n)/8, ", ")) \\ _G. C. Greubel_, Oct 13 2017
%o A123367 (Magma) [(Factorial(n)-2^n)/8: n in [4..25]]; // _G. C. Greubel_, Oct 13 2017
%Y A123367 Cf. A123642.
%K A123367 nonn
%O A123367 4,2
%A A123367 _Aminu Alhaji Ibrahim_, Oct 12 2006
%E A123367 Corrected and extended by _Harvey P. Dale_, Aug 19 2012