147753

Appears in sequences

• Number of edges in a polygon whose boundary consists of n+2 equally spaced points around a semicircle and n+2 equally spaced points along the diameter (a total of 2n+2 points). See Comments for precise definition.at n=20A334459
• Number of (edge) 5-critical graphs on n vertices.at n=7A389840
• Triangle read by rows: T(n,k) is the number of k-critical graphs with n vertices and degree k, (4 <= k <= n).at n=37A389841