G.f.: A(x) = exp( Sum_{n>=1} (2^n + 1)^n * x^n/n ), a power series in x with integer coefficients.
A155201
G.f.: A(x) = exp( Sum_{n>=1} (2^n + 1)^n * x^n/n ), a power series in x with integer coefficients.
Terms
- a(0) =1a(1) =3a(2) =17a(3) =285a(4) =21747a(5) =7894143a(6) =12593691755
External references
- oeis: A155201