-524286domain: ZAppears in sequencesa(0)=1, a(n) = 2 - 2^(n-1) for n>0.at n=20A122958a(0) = 1, a(n) = (-1)^n*(2-2^(n-1)) for n>0.at n=20A122959a(n) = (-2*I)^n + (2*I)^n + (1/2 + 1/2*I*sqrt(3))^n + (1/2 - 1/2*I*sqrt(3))^n.at n=18A153265Write x/(1-x) in the form Sum_{j>=1} a(j)*x^j/(1+a(j)*x^j).at n=37A290971