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A141487
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Number of n X n binary matrices, symmetric under 90-degree rotation, with no more than 1 one in any 2 X 2 subblock.
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1
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1, 2, 1, 3, 4, 13, 17, 82, 167, 1029, 2594, 22033, 77729, 874498, 4050975, 61638683, 387821570, 7893076251, 66271702355, 1814566347320, 20521356444643, 753627817663469, 11423997447177546, 563598221301212705
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OFFSET
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0,2
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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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