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 A127488 #7 Oct 26 2017 16:13:17
%S A127488 6,30240,435891456000,64630041847212441600000,
%T A127488 258328699159653623241666283438080000000
%N A127488 a(n) = (n^2)!/(2*(n!)).
%F A127488 a(n) ~ n^(2*n^2 - n + 1/2) / (2 * exp(n*(n-1))). - _Vaclav Kotesovec_, Oct 26 2017
%t A127488 Table[(n^2)!/(2(n!)), {n, 2, 6}]
%Y A127488 Cf. A000142, A001044, A000442, A036740, A010050, A009445, A134366, A134367, A134368, A134369, A134371, A134372, A134373, A134374, A134374
%K A127488 nonn
%O A127488 2,1
%A A127488 _Artur Jasinski_, Jan 16 2007