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 A139175 #14 Sep 08 2022 08:45:33
%S A139175 23,143,1007,8063,72575,725759,7983359,95800319,1245404159,
%T A139175 17435658239,261534873599,4184557977599,71137485619199,
%U A139175 1280474741145599,24329020081766399,486580401635327999
%N A139175 a(n) = (n! - 5)/5.
%C A139175 Original name: Natural numbers of the form (n!-5)/5.
%H A139175 Vincenzo Librandi, <a href="/A139175/b139175.txt">Table of n, a(n) for n = 5..300</a>
%F A139175 E.g.f.: (120 - 60*x^2 - 40*x^3 - 15*x^4 + 19*x^5)/(120*(1-x)) - exp(x). - _G. C. Greubel_, Oct 18 2018
%t A139175 Table[(n! - 5)/5, {n, 5, 20}]
%o A139175 (Magma) [(Factorial(n)-5)/5: n in [5..25]]; // _Vincenzo Librandi_, Jul 20 2011
%o A139175 (PARI) for(n=5,25, print1((n! -5)/5, ", ")) \\ _G. C. Greubel_, Oct 18 2018
%Y A139175 Cf. A033312, A139172, A139173, A139174, A139175, A139176, A139177, A139183, A139184.
%K A139175 nonn
%O A139175 5,1
%A A139175 _Artur Jasinski_, Apr 11 2008
%E A139175 Corrected offset from 4 to 5 by _Vincenzo Librandi_, Jul 20 2011
%E A139175 New name from _Jon E. Schoenfield_, Oct 18 2018