422449domain: NAppears in sequencesNumber of rooted trees with 2-colored leaves.at n=12A029856Number of rooted trees of nonempty sets with n points. (Each node is a set of 1 or more points.)at n=13A036249a(n) = -1 - 2*n + n^2 + 2*n^3 + n^4.at n=25A165568