G.f.: A(x) = exp( Sum_{n>=1} 4^[(n^2+1)/2]*x^n/n ), a power series in x with integer coefficients.

A156337

G.f.: A(x) = exp( Sum_{n>=1} 4^[(n^2+1)/2]*x^n/n ), a power series in x with integer coefficients.

Terms

    a(0) =1a(1) =4a(2) =16a(3) =384a(4) =17856a(5) =13492992a(6) =11507268608

External references