67998

Appears in sequences

• Number of 4-step E, S, NW and NE-moving king's tours on an n X n board summed over all starting positions.at n=35A187587
• a(n) = 2*a(n-1) - a(n-3) + a(ceiling(n/2)), where a(0) = 1, a(1) = 2, a(2) = 3.at n=18A298405