1140102domain: NAppears in sequencesNumber of strings of n 2's and 3's having a tail of length 1.at n=21A217210Number of (n+1) X (5+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.at n=30A258551