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A140990
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Half the number of n X n binary matrices having equal row sums.
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1
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1, 3, 28, 905, 103126, 43437282, 66141208960, 385335180349569, 8212830157184175946, 683805150345009276656138, 209730232681034628698652412600, 254785524744054762580308183579130562
(list; graph; refs; listen; history; internal format)
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