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A251318
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Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock having one or two 1s
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1
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10, 116, 2804, 157312, 18415674, 4911447738, 2766068478692, 3496332976040148, 9445243384724999530, 56648036031686971128288, 732454090774743685368594486, 20877132584603122578819078333432, 1289954839986383433021857780921092718
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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..0..1..0..1....0..1..0..1..0....0..1..0..0..1....0..0..0..1..1
..1..0..1..0..0....1..0..1..0..1....1..0..1..0..0....1..1..0..0..0
..1..0..0..1..0....0..1..0..0..0....1..0..1..0..1....0..0..0..1..1
..0..0..1..0..0....0..0..0..1..0....1..0..0..1..0....0..1..0..0..0
..1..1..0..0..1....1..0..1..0..1....0..0..1..0..1....1..0..0..1..1
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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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