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 A294320 #5 Oct 28 2017 11:04:42
%S A294320 1,120,43545600,271159356948480000,96447974277170077976494080000000,
%T A294320 4927617876373416030299815278723491640115200000000000,
%U A294320 76433315893700635598991132508610825923227961061372903345356800000000000000000
%N A294320 a(n) = Product_{k=0..n} (4*k + 1)!.
%F A294320 a(n) ~ 2^(4*n^2 + 15*n/2 + 10/3) * n^(2*n^2 + 7*n/2 + 65/48) * Pi^(n/2 + 3/4) / (A^(1/4) * Gamma(1/4)^(1/2) * exp(3*n^2 + 7*n/2 - 1/48)), where A is the Glaisher-Kinkelin constant A074962.
%F A294320 A268505(n) * A294320(n) * A294321(n) * A294322(n) = A000178(4*n + 3).
%t A294320 Table[Product[(4*k + 1)!, {k, 0, n}] , {n, 0, 10}]
%Y A294320 Cf. A168467, A268505, A294318, A294321, A294322.
%K A294320 nonn
%O A294320 0,2
%A A294320 _Vaclav Kotesovec_, Oct 28 2017