G.f.: A(x) = Sum_{n>=0} x^n * (2^n + A(x))^n / (1 + 2^n*x*A(x))^(n+1).
A307123
G.f.: A(x) = Sum_{n>=0} x^n * (2^n + A(x))^n / (1 + 2^n*x*A(x))^(n+1).
Terms
- a(0) =1a(1) =2a(2) =14a(3) =456a(4) =62242a(5) =32889024a(6) =68215273298
External references
- oeis: A307123