59404

Appears in sequences

• Number of 5-step left-handed knight's tours (moves only out two, left one) on an n X n board summed over all starting positions.at n=28A187175
• Number of vertices 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=19A334458