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A227746
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Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having determinant equal to one
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0
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2, 13, 210, 10092, 1378923, 536234494, 593219255593, 1866485946679255, 16707964949615383863, 425495289603079437453771, 30826893520750966059187346452
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=4
..1..0..0..1....1..0..0..1....1..0..1..0....0..1..0..1....0..0..1..0
..0..0..0..1....0..0..0..0....0..0..0..0....0..0..1..0....1..0..1..0
..1..0..0..0....0..0..0..0....1..0..1..0....0..0..1..0....1..1..0..1
..1..1..0..1....0..0..1..0....0..1..0..1....0..1..0..0....0..0..0..0
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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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