2757888

Appears in sequences

• Number of ways to place 3 nonattacking queens on an n X n toroidal board.at n=17A172518
• Numbers n such that n = k/d(k) has exactly 5 solutions, where d(k) = number of divisors of k.at n=28A217126
• a(n) is the number of labeled rooted ordered binary trees T where the nodes are labeled with distinct positive integers, the root has label n, each parent label equals the sum of its children labels, and T cannot be extended.at n=33A348851