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A151802
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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.
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0
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2, 4, 13, 54, 257, 1384, 8303, 54674, 390943, 3009943, 24782522, 216985032, 2010748246, 19641718283, 201551129440
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