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A204480
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Number of (n+2)X7 0..3 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..3 introduced in row major order
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1
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7191, 8114, 2632, 3270, 6494, 11338, 35990, 132258, 473380, 1786812, 6773680, 25609458, 97080840, 368071380, 1395260888, 5289809914, 20055230346, 76034546154, 288268775378, 1092910015022, 4143534627852, 15709332220768
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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) = 4*a(n-1) +a(n-2) -2*a(n-3) -19*a(n-4) -4*a(n-5) +21*a(n-6) +24*a(n-7) +3*a(n-8) -18*a(n-9) -9*a(n-10) for n>13
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EXAMPLE
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Some solutions for n=3
..0..1..0..0..2..2..0....0..1..1..2..2..0..0....0..1..0..0..2..2..3
..0..1..0..0..2..2..2....0..1..1..2..2..2..2....0..1..0..0..2..2..2
..0..1..0..0..2..2..3....0..1..1..2..2..1..2....0..1..0..0..2..2..0
..0..0..0..0..2..2..3....1..1..1..2..2..1..2....0..0..0..0..2..2..0
..3..2..0..0..2..2..3....2..1..1..2..2..1..2....1..1..0..0..2..2..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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