G.f.: A(x) = exp( Sum_{n>=1} 3^(n^2) * x^n/n ), a power series in x with integer coefficients.
A155203
G.f.: A(x) = exp( Sum_{n>=1} 3^(n^2) * x^n/n ), a power series in x with integer coefficients.
Terms
- a(0) =1a(1) =3a(2) =45a(3) =6687a(4) =10782369a(5) =169490304819
External references
- oeis: A155203