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A297392
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Number of nX5 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 neighboring 1.
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1
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6, 33, 127, 700, 3175, 15541, 74736, 358341, 1729617, 8308924, 40006463, 192481249, 926168176, 4456879585, 21445119255, 103193473908, 496552428929, 2389355832929, 11497320733428, 55323763675221, 266211857683333
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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-1) +8*a(n-2) +27*a(n-3) +77*a(n-4) +164*a(n-5) -4*a(n-6) -124*a(n-7) -71*a(n-8) -231*a(n-9) -293*a(n-10) -114*a(n-11) -16*a(n-12) +2*a(n-13) +40*a(n-14) +98*a(n-15) +32*a(n-16) +16*a(n-17) +5*a(n-18) +a(n-19) -a(n-20)
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EXAMPLE
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Some solutions for n=5
..0..0..1..0..0. .1..0..0..0..1. .0..0..1..1..0. .0..0..0..0..0
..0..0..0..1..0. .0..1..0..1..0. .0..0..0..0..0. .0..0..0..1..0
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..1
..0..0..0..1..0. .0..0..0..1..0. .0..0..0..0..0. .1..1..0..0..0
..0..0..1..0..0. .1..1..0..0..1. .1..1..0..0..0. .0..0..0..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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