%I #4 Dec 18 2015 18:17:15
%S 2,4,21,242,4027,87082,2381388,80218256,3251373408,155558286540
%N Number of n X n binary arrays with rows, considered as binary numbers, in strictly increasing order, and columns, considered as binary numbers, in nondecreasing order, and no more than 3 ones in any row or column.
%K nonn
%O 1,1
%A _R. H. Hardin_ Jun 27 2009