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A252393
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Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum less than 4
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1
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21544, 437023, 9807871, 203636149, 4246242886, 89843675557, 1892602521123, 39809382457721, 838416758796711, 17657051023542125, 371771844206074736, 7828257407198464484, 164840943826619948011, 3471012673803505488234
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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=1
..1..0..1..0....0..0..0..2....1..1..0..1....1..0..1..0....1..2..0..0
..2..1..0..1....0..1..0..0....0..0..0..1....0..2..1..0....0..0..1..1
..0..0..0..1....0..0..1..0....0..2..0..0....0..1..0..2....2..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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