a(n) = a(n-1)*a(n-2) with a(0)=1, a(1)=4.

A010099

a(n) = a(n-1)*a(n-2) with a(0)=1, a(1)=4.

Terms

    a(0) =1a(1) =4a(2) =4a(3) =16a(4) =64a(5) =1024a(6) =65536a(7) =67108864

External references