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A140305
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Number of n X n binary matrices containing no more than two 1s in any 3 X 3 sub-block.
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0
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1, 2, 11, 46, 824, 27178, 1020762, 102044420, 20297233254, 6218446852487, 3906297811846469, 4829512709969500388, 10588146860457194561192, 44163637535605999104548698
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