41368320domain: NAppears in sequencesNumber of ordered pairs of permutation functions on n elements where f(f(f(x))) = g(g(g(x))).at n=9A239838a(n) is the unique integer k such that A108951(k) = n!.at n=19A307035E.g.f. satisfies A(x) = (1 - x * log(1 - x) * A(x))^2.at n=9A377438