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A258521
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Number of (n+2)X(3+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two sums of the central column and central row nondecreasing horizontally and vertically
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1
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6516, 13616, 19920, 25076, 25532, 23907, 23398, 26321, 30168, 33303, 35726, 37801, 40964, 45772, 52250, 58011, 62266, 68264, 77152, 89383, 98654, 107242, 119496, 135431, 157308, 174258, 192562, 217067, 245492, 287238, 320266, 357737, 405498
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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) = a(n-4) +4*a(n-5) -4*a(n-9) -5*a(n-10) +5*a(n-14) +2*a(n-15) -2*a(n-19) for n>39
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EXAMPLE
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Some solutions for n=4
..0..1..1..1..0....0..0..0..1..1....0..0..0..0..0....1..0..1..1..1
..0..1..1..0..0....0..1..1..0..1....1..1..1..0..0....1..1..1..0..0
..0..1..1..0..0....0..1..1..0..1....0..1..1..0..0....0..1..0..0..1
..1..1..0..0..1....1..1..0..0..1....1..1..0..0..0....0..1..0..0..1
..1..1..0..0..1....0..1..1..1..0....1..0..0..1..0....1..0..0..0..1
..0..1..1..0..0....1..1..1..1..1....1..1..1..0..0....1..0..1..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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