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A258519
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Number of (n+2)X(1+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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512, 2371, 6516, 16196, 47704, 156873, 488240, 1356489, 3595084, 9838222, 27777116, 77335445, 208141440, 551798439, 1474962640, 3975082026, 10653614768, 28234277048, 74474840360, 196928705327, 521756834144, 1378970429074
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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) -26*a(n-2) +44*a(n-3) -23*a(n-4) -56*a(n-5) -7*a(n-6) +480*a(n-7) -973*a(n-8) +412*a(n-9) +1761*a(n-10) -2196*a(n-11) -3393*a(n-12) +8720*a(n-13) -2593*a(n-14) -16840*a(n-15) +23470*a(n-16) +11156*a(n-17) -39087*a(n-18) +6704*a(n-19) +66632*a(n-20) -91824*a(n-21) -12160*a(n-22) +88000*a(n-23) -10048*a(n-24) -99584*a(n-25) +126720*a(n-26) -9216*a(n-27) -78848*a(n-28) +16384*a(n-29) +16384*a(n-30) for n>34
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EXAMPLE
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Some solutions for n=4
..0..1..1....1..0..0....1..0..0....0..1..0....1..1..0....0..0..1....1..1..0
..1..1..0....0..0..1....0..1..1....1..1..0....1..1..1....1..0..0....0..0..1
..0..1..1....0..1..1....1..0..0....0..0..0....0..0..1....1..1..0....0..0..1
..0..0..0....0..0..0....1..0..1....0..1..1....0..0..0....0..0..0....1..0..0
..1..1..0....1..1..0....1..0..1....1..0..0....0..1..0....1..1..0....1..0..0
..1..0..1....0..0..1....1..1..1....1..1..1....1..0..1....0..0..1....0..0..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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