a(n) = floor(a(n-1)^(3/2)), a(1) = 4.

A254404

a(n) = floor(a(n-1)^(3/2)), a(1) = 4.

Terms

    a(0) =4a(1) =8a(2) =22a(3) =103a(4) =1045a(5) =33781a(6) =6208815a(7) =15470810960

External references