G.f.: A(x) = (1+x) + x*A_2(x)^2; A_2(x) = (1+x)^2 + x*A_3(x)^2; ...; A_{n}(x) = (1+x)^n + x*A_{n+1}(x)^2 for n>=1 with A(x) = A_1(x).

A138295

G.f.: A(x) = (1+x) + x*A_2(x)^2; A_2(x) = (1+x)^2 + x*A_3(x)^2; ...; A_{n}(x) = (1+x)^n + x*A_{n+1}(x)^2 for n>=1 with A(x) = A_1(x).

Terms

    a(0) =1a(1) =2a(2) =6a(3) =27a(4) =138a(5) =789a(6) =4878a(7) =32114a(8) =222690a(9) =1614412a(10) =12169408a(11) =94991253a(12) =765378476a(13) =6349688936a(14) =54128566708a(15) =473335781532

External references