G.f.: Sum_{n>=0} arctanh(2^n*x)^n / n!, a power series in x with integer coefficients.
A136749
G.f.: Sum_{n>=0} arctanh(2^n*x)^n / n!, a power series in x with integer coefficients.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =88a(4) =2816a(5) =285088a(6) =96376832a(7) =112173964160
External references
- oeis: A136749