-1162261467domain: ZAppears in sequencesExpansion of bracket function.at n=37A000748Expansion of (1-3*x+12*x^2)/((1-3*x)*(1+3*x)).at n=19A091103A transform of the Jacobsthal numbers.at n=41A103312Inverse binomial transform of A140962.at n=21A141413Powers of -3: a(n) = (-3)^n.at n=19A352779