207362

Appears in sequences

• Triangle read by rows: T(n,k) is the number of unlabeled directed graphs on n nodes with k arcs, k=0..n*(n-1).at n=60A052283
• Triangle read by rows: T(n,k) is the number of unlabeled directed graphs on n nodes with k arcs, k=0..n*(n-1).at n=62A052283
• a(n) = 2*A001610(n).at n=23A168674
• Number of Hamiltonian cycles in the generalized Petersen Graph P(n,2).at n=45A195197
• The number of Hamiltonian cycles in the concentric ring graph of order n.at n=21A384294