G.f.: A(x) = exp( Sum_{n>=1} (3^n + 1)^n * x^n/n ), a power series in x with integer coefficients.
A155204
G.f.: A(x) = exp( Sum_{n>=1} (3^n + 1)^n * x^n/n ), a power series in x with integer coefficients.
Terms
- a(0) =1a(1) =4a(2) =58a(3) =7528a(4) =11333974a(5) =173018964568
External references
- oeis: A155204