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 A139174 #29 Sep 08 2022 08:45:33
%S A139174 5,29,179,1259,10079,90719,907199,9979199,119750399,1556755199,
%T A139174 21794572799,326918591999,5230697471999,88921857023999,
%U A139174 1600593426431999,30411275102207999,608225502044159999
%N A139174 a(n) = (n!-4)/4.
%C A139174 In the solution set of the equation, n! + s^2 = m^2, for any n>=4 the maximum value of s is (n!-4)/4. - _Sudipta Mallick_, Jul 27 2019
%H A139174 Sudipta Mallick, <a href="/A139174/b139174.txt">Table of n, a(n) for n = 4..400</a> (terms 4..300 from Vincenzo Librandi)
%F A139174 a(n) = numerator(((n+2)!-4)/(7*(n+2)!)), with offset 2. [_Gary Detlefs_, Nov 07 2010]
%F A139174 E.g.f.: -exp(x)-(12+x^2*(-6+(-4+x)*x))/(12*(-1+x)). - _Stefano Spezia_, Sep 08 2019
%t A139174 Table[(n! - 4)/4, {n, 4, 20}]
%o A139174 (Magma) [(Factorial(n)-4)/4: n in [4..25]]; // _Vincenzo Librandi_, Jul 20 2011
%Y A139174 Cf. A033312, A139172, A139173, A139174, A139175, A139176, A139177, A139183, A139184.
%K A139174 nonn,easy
%O A139174 4,1
%A A139174 _Artur Jasinski_, Apr 11 2008
%E A139174 Definition corrected by _Gary Detlefs_, Nov 07 2010