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A140984
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Half the number of n X n binary matrices, symmetric under 180 degree rotation, having equal row sums.
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1
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1, 2, 4, 35, 226, 7592, 156752, 22458249, 1718157826, 941605438142, 250228936146872, 572800408273738658, 580834777459374862880, 5136409738603278958315040, 18792196647668946085817284928
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history;
text;
internal format)
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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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