505800domain: NAppears in sequencesNumber of 4-turn rook's tours on an n X n board summed over all starting positions.at n=9A187191Number of (w,x,y,z) with all terms in {1,...,n} and w<=|x-y|+|y-z|.at n=30A212673Number of length-6 0..n arrays with no repeated value equal to the previous repeated value.at n=7A269470