The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #2 Mar 30 2012 18:59:02
%S 1,5,25,50,250,500,1000,5000,25000,50000,100000,500000,1000000,
%T 5000000,25000000,50000000,250000000,500000000,1000000000,5000000000,
%U 10000000000,50000000000,250000000000,500000000000,1000000000000
%N a(n)=Product{k=0..n, 1+4^A010060(k)}/2.
%K easy,nonn
%O 0,2
%A _Paul Barry_, Dec 10 2004