-27351domain: ZAppears in sequencesG.f.: imaginary part of 1/(1 - i*x - i*x^2) where i=sqrt(-1).at n=31A201838Product_{n>=1} (1 + a(n)*x^n/n!) = 1 + arcsinh(x).at n=8A353819Product_{n>=1} 1 / (1 - a(n)*x^n/n!) = 1 + arcsinh(x).at n=8A353914