A163950 - OEIS

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).

%I #4 Aug 17 2017 06:01:21

%S 1,1,12,118,1405,19476,300559

%N 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).

%C The complementary set to A163949.

%F a(n) = n^n - A163949(n).

%Y Cf. A163947, A163948, A163949.

%K more,nonn

%O 1,3

%A _Carlos Alves_, Aug 06 2009