917822domain: NAppears in sequencesNumber of (n+1) X (4+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=29A258550Total number of 0's in all (binary) max-heaps on n elements from the set {0,1}.at n=27A309051