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A140974
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Number of binary n X n matrices symmetric about both diagonals with rows, considered as binary numbers, in nondecreasing order.
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0
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1, 2, 3, 4, 8, 16, 43, 136, 513, 2662, 15276, 134366, 1233504, 18634052, 281749759, 7363023774, 187712397424, 8557170854702, 375321111906249
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