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A139012
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Number of n X n symmetric binary matrices containing no more than three 1s in any 3 X 3 sub-block.
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0
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1, 2, 7, 20, 146, 1660, 24266, 619885, 24951532, 1491389352, 141842503743, 21156539568960, 4861988525864115, 1744688422871068399, 977626718408600885914, 851525107752786868842753
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