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A297678
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Number of nX4 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 1 or 4 neighboring 1s.
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1
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13, 80, 629, 4633, 34872, 260924, 1955750, 14651847, 109783269, 822547725, 6162992737, 46176452589, 345979170190, 2592263829464, 19422650189445, 145525052534819, 1090352803546358, 8169515919608631, 61210454258421286
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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) = 6*a(n-1) +10*a(n-2) +6*a(n-3) +26*a(n-4) -31*a(n-5) -a(n-6) -165*a(n-7) -22*a(n-8) +181*a(n-9) +39*a(n-10) -54*a(n-11) -15*a(n-12) +6*a(n-13) -4*a(n-14) -a(n-15) +2*a(n-16)
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EXAMPLE
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Some solutions for n=5
..1..0..0..0. .1..0..1..0. .0..0..0..1. .1..1..0..0. .0..0..0..0
..0..1..0..0. .1..0..1..0. .1..1..0..0. .0..0..0..1. .0..0..0..1
..0..1..0..1. .1..1..1..0. .0..0..0..0. .0..0..0..0. .1..0..0..1
..0..0..0..0. .0..0..0..0. .1..0..0..1. .0..0..0..0. .0..0..0..1
..0..1..0..1. .0..0..0..0. .1..0..1..0. .0..0..0..0. .1..0..1..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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