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A139810
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Number of n X n binary matrices containing no 2 X 2 all-1s sub-block.
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11
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1, 2, 15, 417, 42176, 15701273, 21418970801, 107224417436160, 1968910887183791359, 132633131268024896655873, 32775983842712963307230834176, 29712661745725058784174163778464369
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