104202domain: NAppears in sequencesG.f. A(x) satisfies A(x) = 1 / ((1 + x) * (1 - x * (1 + x + x^2 + x^3) * A(x^4))).at n=19A367718Expansion of 1 / ((1-x)^2 - x^6)^2.at n=22A392554