Coefficients of x^n in the (n+1)-th self-composition of the g.f. of A120010: a(n) = [x^n] { (1-sqrt(1-4*x))/2 o x/(1-(n+1)*x) o (x-x^2) } for n>=1.
A120021
Coefficients of x^n in the (n+1)-th self-composition of the g.f. of A120010: a(n) = [x^n] { (1-sqrt(1-4*x))/2 o x/(1-(n+1)*x) o (x-x^2) } for n>=1.
Terms
- a(0) =1a(1) =3a(2) =16a(3) =130a(4) =1416a(5) =19236a(6) =312512a(7) =5906502a(8) =127313320a(9) =3082645951a(10) =82848394752
External references
- oeis: A120021