9980210domain: NAppears in sequencesG.f.: A(x) = 1/(1 - x*B(x^3)), where B(x) = Sum_{n>=0} a(n)^3*x^n is the g.f. of A121652.at n=40A121653A trisection of A121653; a(n) = A121653(3*n+1) = A121652(3*n+1)^(1/3).at n=13A121655