3461873536domain: NAppears in sequencesa(n) is the number of c-nets with n+1 vertices and 2n edges, n >= 1.at n=12A001506Triangle read by rows: T(n,k) is the number of c-nets with n+1 faces and k+1 vertices, 1 <= k <= n. But see A290326 for a better version.at n=90A210252