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A251223
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Number of (n+1)X(3+1) 0..1 arrays with no 2X2 subblock having the minimum of its diagonal elements greater than the absolute difference of its antidiagonal elements
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1
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171, 1892, 20782, 228689, 2515011, 27662994, 304255924, 3346446223, 36806732398, 404828461391, 4452610577279, 48973192395914, 538644351143299, 5924419545393448, 65161264266944558, 716693058210959682
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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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FORMULA
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Empirical: a(n) = 8*a(n-1) +39*a(n-2) -48*a(n-3) -210*a(n-4) +88*a(n-5) +260*a(n-6) -199*a(n-7) +36*a(n-8)
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EXAMPLE
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Some solutions for n=3
..0..1..0..0....0..1..0..1....0..0..1..0....1..1..0..0....0..0..0..1
..1..1..1..1....0..1..0..1....0..1..0..0....0..0..0..1....1..1..0..0
..0..0..0..0....1..1..0..0....0..1..1..0....0..0..0..1....0..1..0..0
..1..1..1..1....0..1..1..1....1..1..0..0....0..1..0..0....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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