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A204049
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Number of (n+2)X3 0..3 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..3 introduced in row major order
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1
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1379, 10447, 80391, 622031, 4823759, 37451727, 290942303, 2260735279, 17568741535, 136538226767, 1061153916031, 8247213992175, 64097090111007, 498161733185935, 3871710470155071, 30090928730621231, 233866710624036959
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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) = 11*a(n-1) -31*a(n-2) +69*a(n-3) -176*a(n-4) -8*a(n-5) -116*a(n-6) -132*a(n-7) +240*a(n-8) +144*a(n-9)
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EXAMPLE
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Some solutions for n=3
..0..0..0....0..0..0....0..1..0....0..0..0....0..0..0....0..1..0....0..0..0
..0..0..0....1..0..1....2..0..0....0..0..0....0..0..0....0..0..1....0..0..1
..0..0..0....0..1..0....2..0..0....1..0..0....1..0..0....1..0..0....0..0..2
..0..0..0....1..0..1....0..2..1....1..1..0....0..0..0....2..1..0....3..2..0
..1..1..0....1..1..0....2..2..2....2..1..1....0..0..2....0..3..1....2..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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