-398991360domain: ZAppears in sequencesProduct_{n>=1} (1 + a(n)*x^n/n!) = 1 + arctan(x).at n=12A353820Product_{n>=1} 1 / (1 - a(n)*x^n/n!) = 1 + arctan(x).at n=12A353915Product_{n>=1} 1 / (1 - x^n)^(a(n)/n!) = 1 + arctan(x).at n=12A354117Product_{n>=1} (1 + x^n)^(a(n)/n!) = 1 + arctan(x).at n=12A354275