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 A272244 #15 Dec 04 2023 04:27:34
%S A272244 0,2,160,21060,4352000,1313845000,547573478400,301758856490000,
%T A272244 212663770808320000,186659516597629140000,199722414913149440000000,
%U A272244 255947740845844788169000000,387074162712817024892928000000,682170272459193898736228210000000
%N A272244 a(n) = Product_{k=0..n} (n^2 + k^2).
%F A272244 a(n) ~ 2^(n + 1/2) * n^(2*(n+1)) / exp((4-Pi)*n/2).
%t A272244 Table[Product[n^2+k^2,{k,0,n}],{n,0,15}]
%Y A272244 Cf. A126804, A272246, A272247, A272248, A367823, A367833.
%Y A272244 Cf. A101686, A272180, A323540, A324403.
%K A272244 nonn,easy
%O A272244 0,2
%A A272244 _Vaclav Kotesovec_, Apr 23 2016