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A297697
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Number of 4Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 2 or 4 neighboring 1s.
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1
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16, 48, 415, 1774, 12214, 60904, 378611, 2026447, 12017015, 66465945, 385592382, 2165486783, 12434785358, 70330789227, 401931843469, 2280829145222, 13005603168706, 73915930618863, 421040013595102, 2394648017238224
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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) +25*a(n-2) -166*a(n-3) -163*a(n-4) +1490*a(n-5) +278*a(n-6) -5665*a(n-7) -251*a(n-8) +9559*a(n-9) +2285*a(n-10) -4496*a(n-11) -5180*a(n-12) -5803*a(n-13) +491*a(n-14) +5580*a(n-15) +4942*a(n-16) +1233*a(n-17) -1413*a(n-18) -1469*a(n-19) -650*a(n-20) -78*a(n-21) +13*a(n-22) +31*a(n-23) +14*a(n-24)
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EXAMPLE
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Some solutions for n=6
..0..0..1..0..0..1. .0..0..0..0..0..1. .1..0..0..0..0..0. .0..1..0..1..1..0
..0..0..0..0..0..1. .0..0..0..0..0..0. .0..0..0..0..0..0. .0..0..0..1..1..0
..1..1..0..1..0..0. .0..0..1..1..1..1. .0..1..0..0..1..1. .1..1..0..0..0..0
..1..1..0..1..0..0. .1..0..1..1..1..1. .0..1..0..0..1..1. .1..1..0..1..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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