Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(f(g(x))) = g(f(x)).
A239762
Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(f(g(x))) = g(f(x)).
Terms
- a(0) =1a(1) =1a(2) =10a(3) =159a(4) =3568a(5) =106545a(6) =4062336a(7) =192754009
External references
- oeis: A239762