2^2^2^ ... 2^w (with n 2's), where w = 1.92878... = A086238.

A016104

2^2^2^ ... 2^w (with n 2's), where w = 1.92878... = A086238.

Terms

    a(0) =1a(1) =3a(2) =13a(3) =16381

External references