The number of functions in a finite set that can be expressed by a composition power of another function. (It differs from A163948, as it excludes self compositions).
A163950
The number of functions in a finite set that can be expressed by a composition power of another function. (It differs from A163948, as it excludes self compositions).
Terms
- a(0) =1a(1) =1a(2) =12a(3) =118a(4) =1405a(5) =19476a(6) =300559
External references
- oeis: A163950