G.f.: A(x) = 1 + x*A_1(x)^2; A_1(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>=0 with A(x) = A_0(x).
A138294
G.f.: A(x) = 1 + x*A_1(x)^2; A_1(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>=0 with A(x) = A_0(x).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =16a(4) =78a(5) =420a(6) =2454a(7) =15297a(8) =100660a(9) =694022a(10) =4986128a(11) =37171749a(12) =286619290a(13) =2279866324a(14) =18668221560a(15) =157080129914
External references
- oeis: A138294