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 A139151 #19 Oct 14 2024 01:38:30
%S A139151 7,31,181,1261,10081,90721,907201,9979201,119750401,1556755201,
%T A139151 21794572801,326918592001,5230697472001,88921857024001,
%U A139151 1600593426432001,30411275102208001,608225502044160001,12772735542927360001
%N A139151 a(n) = (n!+4)/4.
%C A139151 Maximal solution for x such that x^2-y^2 = n! (because ((n! + 4)/4)^2 - ((n! - 4)/4)^2 = n! ). - _Artur Jasinski_, Mar 31 2012
%H A139151 Amiram Eldar, <a href="/A139151/b139151.txt">Table of n, a(n) for n = 4..450</a>
%t A139151 Table[(n! + 4)/4, {n, 4, 30}]
%o A139151 (PARI) a(n)=n!/4+1 \\ _Charles R Greathouse IV_, Jun 20 2012
%Y A139151 Cf. A139149, A139150, A139152, A139153, A139154, A139155, A139156, A139157.
%K A139151 nonn,easy
%O A139151 4,1
%A A139151 _Artur Jasinski_, Apr 11 2008