999776domain: NAppears in sequencesNumber of cyclic arrangements of S={1,2,...,n} such that the difference between any two neighbors is at most 4.at n=16A242526Number of nX4 0..1 arrays with every element unequal to 1, 2, 5, 6 or 8 king-move adjacent elements, with upper left element zero.at n=18A305512