G.f.: A(x) = exp( Sum_{n>=1} (4^n - 1)^n/3^(n-1) * x^n/n ), a power series in x with integer coefficients.
A155210
G.f.: A(x) = exp( Sum_{n>=1} (4^n - 1)^n/3^(n-1) * x^n/n ), a power series in x with integer coefficients.
Terms
- a(0) =1a(1) =3a(2) =42a(3) =9378a(4) =39179127
External references
- oeis: A155210