84370domain: NAppears in sequencesa(n) = A026615(2*n, n).at n=9A026616a(n) = A026615(n, floor(n/2)).at n=18A026621Number of unlabeled rooted trees with n nodes and maximal outdegree (branching factor) 10.at n=11A244406Numbers k whose sum of divisors equals the sum of divisors of 2*k-1.at n=14A289738