-402653184domain: ZAppears in sequencesExpansion of (1-x^2)/(1+2x).at n=29A110164Expansion of (7+8*x)/(1+2*x).at n=27A176414a(n) = 4*a(n-1) - 8*a(n-2) with a(0) = a(1) = 1.at n=19A363092