167423domain: NPropertiesPrimalityPrimeyesAppears in sequencesc(n) = number of c-nets on n vertices.at n=6A106651Triangle read by rows: T(n,k) is the number of c-nets with n-k inner vertices and k outer vertices, 3 <= n, 2 <= k <= n-1.at n=21A285165Prime numbersat n=15294