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A139015
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Number of n X n symmetric binary matrices containing no more than five 1s in any 3 X 3 sub-block.
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0
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1, 2, 8, 44, 530, 11951, 480173, 36013602, 4995124766, 1274350081146, 600639918104102, 522558166736741057, 838554327431003466468, 2483352676636753274201147
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