470856

Appears in sequences

• Number of n-step spirals on cubic lattice.at n=12A006779
• Triangular array read by rows: T(n,k) is the number of functional digraphs on {1,2,...,n} such that every element is mapped to a recurrent element and there are exactly k cycles, n>=1, 1<=k<=n.at n=28A228534
• Expansion of e.g.f.: (1+x) / (exp(-x) - x).at n=7A305990