Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(g(x)) = f(g(g(x))).
A239785
Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(g(x)) = f(g(g(x))).
Terms
- a(0) =1a(1) =1a(2) =14a(3) =411a(4) =19912a(5) =1412745a(6) =136537056a(7) =17121680443
External references
- oeis: A239785