86670domain: NAppears in sequencesa(n) = round(n*phi^18), where phi is the golden ratio, A001622.at n=15A004953a(n) = ceiling(n*phi^18), where phi is the golden ratio, A001622.at n=15A004973Triangle read by rows: T(n,k) is the number of ternary trees with n edges and having k vertices of outdegree 3 (n >= 0, k >= 0).at n=24A120983