Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(g(x)) = g(f(f(x))).
A239755
Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(g(x)) = g(f(f(x))).
Terms
- a(0) =1a(1) =1a(2) =8a(3) =123a(4) =2776a(5) =86265a(6) =3498336a(7) =179365669
External references
- oeis: A239755