%I #4 Dec 18 2015 18:17:15
%S 2,4,13,54,257,1384,8303,54674,390943,3009943,24782522,216985032,
%T 2010748246,19641718283,201551129440
%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 2 ones in any row or column.
%K nonn
%O 1,1
%A _R. H. Hardin_ Jun 27 2009