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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 2 ones in any row or column.
0

%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