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A269106
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Number of nX5 0..3 arrays with some element plus some horizontally or vertically adjacent neighbor totalling three no more than once.
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1
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756, 132300, 17593092, 2085484068, 232068730044, 24808345933548, 2579398703502996, 262780733311913580, 26357371124964908460, 2611360040338484328156, 256155579492309832819860
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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) = 236*a(n-1) -19546*a(n-2) +707906*a(n-3) -13261621*a(n-4) +137719076*a(n-5) -784626841*a(n-6) +2025590366*a(n-7) +1091882414*a(n-8) -18874661724*a(n-9) +33829878231*a(n-10) +10605114324*a(n-11) -91783964484*a(n-12) +94503314304*a(n-13) -30762353664*a(n-14) for n>15
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EXAMPLE
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Some solutions for n=2
..2..1..3..1..0. .0..0..0..2..3. .3..3..1..0..1. .0..1..3..3..3
..0..1..1..0..2. .2..0..2..0..2. .2..1..3..1..1. .1..3..1..1..2
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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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