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A251080
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Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the absolute difference of its antidiagonal elements
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0
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27, 284, 1165, 4718, 14891, 47932, 139553, 402854, 1109887, 3007772, 7941557, 20638750, 52718963, 132874124, 330624073, 813659558
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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..2....0..0..0..0..2....0..0..0..1..2....0..1..0..0..2
..1..0..1..0..2....0..0..0..0..1....0..0..0..0..0....0..1..0..0..2
..2..0..1..0..2....0..0..0..0..1....2..2..2..2..2....0..1..0..0..0
..2..0..1..0..1....0..0..0..0..1....0..0..0..0..0....0..1..0..0..0
..2..0..1..0..1....2..2..2..2..0....2..2..2..2..1....2..1..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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