74872992399domain: NAppears in sequencesNumber of n X n binary matrices with floor(n^2/2) 1's and rows and columns in lexicographically nondecreasing order.at n=7A180978Number of n X n 0..1 arrays with rows and columns lexicographically nondecreasing and the instance counts of every value within one of each other.at n=7A201378