36722domain: NAppears in sequencesNumber of rooted trees with 2-colored leaves.at n=10A029856Number of rooted trees of nonempty sets with n points. (Each node is a set of 1 or more points.)at n=11A036249a(n) = Sum_{k=1..n} k^2 * tau(k)^2, where tau is A000005.at n=17A320897