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A140453
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Half the number of n X n binary matrices, symmetric under horizontal and vertical reflection, having equal row sums.
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1
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1, 1, 2, 3, 10, 28, 164, 905, 9826, 103126, 2031252, 43437282, 1622278624, 66141208960, 4579408029576, 385335180349569, 51207103076632066, 8212830157184175946, 2052124795850957537060, 683805150345009276656138
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OFFSET
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1,3
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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