5170604

Appears in sequences

• Number of rooted planar trees with n non-root nodes: circularly cycling the subtrees at the root gives equivalent trees.at n=15A003239
• Number of n-element subsets of {1,2,...,2n-1} whose elements sum to a multiple of n.at n=14A145855
• Number of elements in the mutation class of a quiver of type D_n.at n=12A159557