G.f. satisfies: A(x) = x + 2*x*A(x) + x*A(A(x)).
A120575
G.f. satisfies: A(x) = x + 2*x*A(x) + x*A(A(x)).
Terms
- a(0) =1a(1) =3a(2) =12a(3) =66a(4) =471a(5) =4044a(6) =39711a(7) =433128a(8) =5153655a(9) =66087525a(10) =905350476a(11) =13162855629a(12) =202073897730
External references
- oeis: A120575