G.f. A(x) satisfies A(A(A(A(x)))) = B(x) (4th self-COMPOSE of A) such that the coefficients of B(x) consist only of numbers {1,2,3,4}, with B(0) = 0.
A112109
G.f. A(x) satisfies A(A(A(A(x)))) = B(x) (4th self-COMPOSE of A) such that the coefficients of B(x) consist only of numbers {1,2,3,4}, with B(0) = 0.
Terms
- a(0) =1a(1) =1a(2) =-2a(3) =8a(4) =-38a(5) =194a(6) =-992a(7) =4777a(8) =-19831a(9) =56116a(10) =48008a(11) =-2062286a(12) =16053636a(13) =-70193968a(14) =155216743a(15) =-968038798a(16) =23817048561a(17) =-233579083166a(18) =333773365
External references
- oeis: A112109