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A251121
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Number of (n+1)X(n+1) 0..1 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements
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0
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10, 40, 108, 266, 580, 1214, 2420, 4702, 8926, 16680, 30766, 56180, 101734, 182956, 327080, 581742, 1030000, 1816290, 3191136, 5588050, 9755530, 16983260, 29489098
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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..0..0..1....0..0..0..1..1....0..0..0..1..1....1..0..1..0..1
..0..0..0..0..1....0..0..0..0..0....1..0..0..0..0....1..0..1..0..1
..0..0..0..0..1....1..1..1..1..1....1..0..0..0..0....1..0..1..0..0
..0..0..0..0..0....0..0..0..0..0....1..0..0..0..0....1..0..1..0..0
..1..0..0..0..0....1..1..0..0..0....1..0..0..0..0....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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