668676domain: NAppears in sequencesNumber of rooted planar 2-trees with n nodes.at n=12A001895Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A089859/A089863.at n=14A089407Valid groups of final digits a square number made entirely of the digits 6, 7 and 8 can have.at n=19A241072