18784170

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=16A003239
• Number of terms in polynomial expression for determinant of generic circulant matrix of order n.at n=15A084575
• Number of elements in the mutation class of a quiver of type D_n.at n=13A159557
• Product_{n>=1} (1+x^n)^a(n) = Sum_{k>=0} C(k)*x^k, where C(k) = A000108(k).at n=15A378424
• a(n) is the number of imprimitive (periodic) 2n-bead balanced binary necklaces.at n=32A386946