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 A129195 #8 Jul 05 2024 14:28:30
%S A129195 1,4,8,32,32,128,256,1024,512,2048,4096,16384,16384,65536,131072,
%T A129195 524288,131072,524288,1048576,4194304,4194304,16777216,33554432,
%U A129195 134217728,67108864,268435456,536870912,2147483648,2147483648,8589934592,17179869184,68719476736
%N A129195 a(n) = denominator(n!/4^n).
%F A129195 a(n) = denominator((1/(2*Pi))*int(exp(i*4*t)(-((Pi-t)/i)^n),t,0,2*Pi)), i=sqrt(-1).
%F A129195 a(n) = 2^A092391(n).
%t A129195 Table[Denominator[n!/4^n],{n,0,30}] (* _Harvey P. Dale_, Mar 05 2013 *)
%Y A129195 Cf. A049606, A092391.
%K A129195 easy,nonn
%O A129195 0,2
%A A129195 _Paul Barry_, Apr 02 2007