The number of functions in a finite set that are not obtainable by a composition power of any other function. Similar to A163947, but it excludes self compositions.
A163949
The number of functions in a finite set that are not obtainable by a composition power of any other function. Similar to A163947, but it excludes self compositions.
Terms
- a(0) =0a(1) =3a(2) =15a(3) =138a(4) =1720a(5) =27180a(6) =522984
External references
- oeis: A163949