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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.
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%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