174528

Appears in sequences

• a(n) = (n-1)^3*((n-2)^2 - 2*(n-3)).at n=12A079503
• a(n) = 8*n^3*((2*n-1)^2 - 4*n + 4).at n=6A079504
• Consider the family of directed multigraphs enriched by the species of arborescences. Sequence gives number of those multigraphs with n labeled loops and arcs.at n=5A099714
• Number of cyclic arrangements of S={1,2,...,n} such that the difference of any two neighbors is not coprime to their sum.at n=13A242534