431874domain: NAppears in sequencesG.f. A(x) satisfies A(x) = (1 + x*A(x))*(1 + x^3*A(x)^3).at n=15A198951Solution of the complementary equation a(n) = a(n-1) + a(n-2) + 2*b(n-1) - b(n-2), where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4.at n=23A294421