-1894domain: ZAppears in sequencessech(tan(x)+arcsin(x))=1-4/2!*x^2+56/4!*x^4-1894/6!*x^6+120872/8!*x^8...at n=3A012959Write 2*x/(1-x) in the form Sum_{j>=1} ((1-x^j)^a(j) - 1).at n=35A290973Product_{n>=1} 1 / (1 - x^n)^(a(n)/n!) = 1 + log(1 + x).at n=5A352691