12815663844
domain: N
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=21A003239
- Number of n-element subsets of {1,2,...,2n-1} whose elements sum to a multiple of n.at n=20A145855
- Number of elements in the mutation class of a quiver of type D_n.at n=18A159557