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A140954
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Half the number of n X n binary matrices, symmetric under vertical reflection, having equal row sums.
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1
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1, 2, 10, 35, 1126, 7592, 1697508, 22458249, 36000614026, 941605438142, 11035829403860196, 572800408273738658, 49759074151291691916640, 5136409738603278958315040, 3340664790391139471267200338312
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OFFSET
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1,2
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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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