66312

Appears in sequences

• Number of ordered quadruples of integers from [ 2,n ] with no global factor.at n=34A015638
• Number of different cuboids with volume (pq)^n, where p,q are distinct prime numbers.at n=34A101427
• L.g.f.: Sum_{n>=1} (Sum_{d|n} d*x^d)^n/n = Sum_{n>=1} a(n)*x^n/n.at n=13A192859
• Number of (undirected) Hamiltonian paths on the triangular grid with n vertices on each side.at n=5A308144
• a(n) = Sum_{k=1..n} J_n(k), where J is the Jordan function, J_n(k) = k^n * Product_{p|k, p prime} (1 - 1/p^n).at n=5A332617
• Total number of graceful labelings of the n-wheel graph.at n=6A333672