57010domain: NAppears in sequencesNumber of (n+1) X (3+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=13A258549Number of subsets of {1..n} such that it is possible to choose a different binary index of each element.at n=25A370636