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A258889
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Number of (n+2)X(3+2) 0..1 arrays with no 3x3 subblock diagonal sum less than the antidiagonal sum or central row sum less than the central column sum
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1
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3036, 4489, 6072, 8100, 12804, 20164, 33252, 54756, 88312, 141376, 227568, 364816, 583204, 929296, 1483776, 2365444, 3775584, 6022116, 9624864, 15382084, 24627120, 39438400, 63264812, 101525776, 163156600, 262310416, 422211920, 679853476
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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) = 3*a(n-1) +3*a(n-2) -16*a(n-3) +5*a(n-4) +23*a(n-5) -24*a(n-6) +15*a(n-7) +9*a(n-8) -58*a(n-9) +41*a(n-10) +17*a(n-11) -32*a(n-12) +45*a(n-13) -27*a(n-14) -24*a(n-15) +27*a(n-16) -15*a(n-17) +8*a(n-18) +9*a(n-19) -9*a(n-20) +2*a(n-21) -a(n-22) -a(n-23) +a(n-24) for n>27
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EXAMPLE
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Some solutions for n=4
..0..0..0..0..0....1..1..0..1..0....1..1..0..1..1....1..1..0..0..0
..1..1..1..1..0....1..1..1..0..1....1..1..0..0..1....1..0..0..0..0
..1..1..1..1..1....1..1..1..1..1....1..0..0..0..1....1..0..0..0..0
..1..1..1..1..1....1..1..1..1..1....1..0..0..0..1....1..0..0..0..1
..0..1..1..1..1....1..0..1..1..1....1..0..0..0..1....1..1..0..1..1
..1..0..1..1..1....0..1..0..1..0....1..0..0..1..1....1..0..0..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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