218627

Properties

Appears in sequences

• Number of simple labeled graphs on n nodes with exactly 2 connected components that are trees or cycles.at n=6A215852
• Number T(n,k) of simple labeled graphs on n nodes with exactly k connected components that are trees or cycles; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=38A215861
• Prime numbersat n=19494