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 A134368 #6 Oct 26 2017 15:53:26
%S A134368 1,4,13824,268738560000,106562062388507443200000,
%T A134368 2283380023591730815784976384000000000000,
%U A134368 5785737804304645733190746102656048717392091545600000000000000
%N A134368 a(n) = ((2n)!)^(n+1).
%F A134368 a(n) ~ 2^((n+1)*(2*n+1)) * exp(1/24 - 2*n*(n+1)) * n^((n+1)*(4*n+1)/2) * Pi^((n+1)/2). - _Vaclav Kotesovec_, Oct 26 2017
%t A134368 Table[((2n)!)^(n + 1), {n, 0, 10}]
%Y A134368 Cf. A000142, A001044, A000442, A036740, A134367, A134368, A134369, A134370, A134371, A134374, A134375.
%K A134368 nonn
%O A134368 0,2
%A A134368 _Artur Jasinski_, Oct 22 2007