138644

Appears in sequences

• Number of ways to place 2 nonattacking wazirs on an n X n board.at n=22A172225
• Number of interior points that are the intersections of exactly two chords in the configuration A006561(n).at n=45A292104
• The number of interior points that are intersections of exactly two chords for a 2n-gon where all its vertices are joined by lines (cf. A006561).at n=22A352144