G.f.: A(x) = exp( Sum_{n>=1} 2^(n^2)*sigma(n)*x^n/n ), a power series in x with integer coefficients.
A156211
G.f.: A(x) = exp( Sum_{n>=1} 2^(n^2)*sigma(n)*x^n/n ), a power series in x with integer coefficients.
Terms
- a(0) =1a(1) =2a(2) =26a(3) =732a(4) =116390a(5) =40513052a(6) =137522735588
External references
- oeis: A156211