A239784 Number of pairs of functions (f,g) from a set of n elements into itself satisfying f(g(g(x))) = f(g(f(x))).
1, 1, 14, 351, 14776, 902605, 75313056, 8194699387
Offset: 0
Crossrefs
Cf. A181162.
Extensions
a(6)-a(7) from Giovanni Resta, Mar 28 2014