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A251284
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Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock having a single 1 or two 1s on the same edge or main diagonally
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1
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9, 71, 822, 18924, 577942, 39473392, 3232216177, 648994836940, 144605658061843, 84335072845188126, 51747558531570898082, 86717653225766506442744, 147921009780997938189659172, 706047665638030677246299851962
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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
..0..1..0..1..0....0..1..0..1..0....0..1..1..0..0....0..1..1..0..0
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..1....0..0..0..0..1
..1..1..0..1..1....0..1..1..0..1....1..0..1..0..0....0..1..1..0..0
..0..0..0..0..0....0..0..0..0..0....1..0..0..0..1....0..0..0..0..1
..1..0..1..1..1....0..1..1..1..0....0..0..1..0..1....1..0..1..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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