G.f.: A(x) = Product_{n>=1} 1/(1 - A_n(x)^n) where A_n(x) denotes the n-th iteration of A(x): A_n(x) = A_{n-1}(A(x)) with A_0(x)=x.

A182970

G.f.: A(x) = Product_{n>=1} 1/(1 - A_n(x)^n) where A_n(x) denotes the n-th iteration of A(x): A_n(x) = A_{n-1}(A(x)) with A_0(x)=x.

Terms

    a(0) =1a(1) =1a(2) =3a(3) =12a(4) =61a(5) =365a(6) =2477a(7) =18566a(8) =150940a(9) =1314016a(10) =12135518a(11) =118077620a(12) =1204031386a(13) =12814054072a(14) =141872524160

External references