Number of pairs of functions f, g from a size n set into itself satisfying f(g(f(x))) = g(f(f(x))).
A239770
Number of pairs of functions f, g from a size n set into itself satisfying f(g(f(x))) = g(f(f(x))).
Terms
- a(0) =1a(1) =1a(2) =10a(3) =213a(4) =7720a(5) =420865a(6) =31879296a(7) =3175850965
External references
- oeis: A239770