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A183468
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Number of nX3 binary arrays with every element equal to either the sum mod 2 of its vertical neighbors or the sum mod 2 of its horizontal neighbors
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1
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3, 12, 33, 111, 374, 1205, 4003, 13229, 43561, 143984, 475288, 1568812, 5180457, 17102445, 56463871, 186423129, 615477689, 2032034670, 6708890695, 22149713002, 73128504204, 241437738178, 797119382220, 2631732694700, 8688806646890
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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)=3*a(n-1)+a(n-2)+8*a(n-3)-25*a(n-4)-5*a(n-5)-20*a(n-6)+62*a(n-7)+24*a(n-8)+3*a(n-9)-42*a(n-10)-44*a(n-11)-24*a(n-12)+26*a(n-13)+32*a(n-14)+11*a(n-15)+3*a(n-16)-4*a(n-18)
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EXAMPLE
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Some solutions for 4X3
..0..0..1....0..0..0....0..0..0....0..1..1....1..1..1....0..1..1....0..0..0
..1..0..1....1..1..0....0..0..0....0..0..0....1..1..1....0..0..0....0..0..0
..1..0..0....1..1..0....0..1..0....1..1..0....1..0..1....1..0..1....0..1..1
..0..0..0....1..1..0....0..1..0....1..1..0....0..0..0....1..0..1....0..1..1
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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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