4973090domain: NAppears in sequencesNumbers n such that n | Sigma_8(n) + Phi(n)^8.at n=18A055702Number of growing tree trajectories (T(1),T(2),...,T(n)), where T(k) is an unlabeled tree on k nodes and T(k) can be obtained from T(k+1) by deletion of a leaf.at n=12A268951