9386496

Appears in sequences

• Triangular array read by rows. T(n,k) is the number of functional digraphs on {1,2,...,n} such that no node is at a distance greater than one from a cycle and there are k recurrent elements whose preimage contains only one element, n>=0, 0<=k<=n.at n=48A220222
• Number of subsets of {2...n} containing every element of {2...n} whose prime indices all belong to the subset.at n=28A324737