-174762domain: ZAppears in sequencesExpansion of (1-x)/(1+x+2*x^2+2*x^3).at n=38A078052A generalized Jacobsthal sequence.at n=18A083944First differences of A133730.at n=39A141416G.f.: (1+x)/(1+x-2*x^2).at n=19A151575