G.f. A(x) satisfies A(A(A(x))) = B(x) (3rd self-COMPOSE of A) such that the coefficients of B(x) consist only of numbers {1,2,3}, with B(0) = 0.

A112107

G.f. A(x) satisfies A(A(A(x))) = B(x) (3rd self-COMPOSE of A) such that the coefficients of B(x) consist only of numbers {1,2,3}, with B(0) = 0.

Terms

    a(0) =1a(1) =1a(2) =-1a(3) =3a(4) =-10a(5) =35a(6) =-119a(7) =360a(8) =-792a(9) =-33a(10) =12779a(11) =-82525a(12) =305861a(13) =-552011a(14) =-126321a(15) =-8385020a(16) =138177591a(17) =-433073834a(18) =-5366414982a(19) =51203452090a(20) =123835509276

External references