A239762 Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(f(g(x))) = g(f(x)).
1, 1, 10, 159, 3568, 106545, 4062336, 192754009
Offset: 0
Crossrefs
Cf. A181162.
Extensions
a(6)-a(7) from Giovanni Resta, Mar 28 2014