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a(n)=Product{k=0..n, 1+3^A010060(k)}/2.
0

%I #2 Mar 30 2012 18:59:02

%S 1,4,16,32,128,256,512,2048,8192,16384,32768,131072,262144,1048576,

%T 4194304,8388608,33554432,67108864,134217728,536870912,1073741824,

%U 4294967296,17179869184,34359738368,68719476736,274877906944

%N a(n)=Product{k=0..n, 1+3^A010060(k)}/2.

%K easy,nonn

%O 0,2

%A _Paul Barry_, Dec 10 2004