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A299684
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Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
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1
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3, 4, 15, 54, 156, 854, 3226, 13013, 56318, 229915, 948257, 3968556, 16399773, 67970006, 282408197, 1170437914, 4854200458, 20140780494, 83525093575, 346439146067, 1437039382529, 5960289119226, 24721884651959, 102541799887631
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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) = 2*a(n-1) +7*a(n-2) +20*a(n-3) -29*a(n-4) -87*a(n-5) -34*a(n-6) +86*a(n-7) +190*a(n-8) -8*a(n-9) -55*a(n-10) -38*a(n-11) +69*a(n-12) -71*a(n-13) -34*a(n-14) +30*a(n-15) for n>17
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EXAMPLE
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Some solutions for n=5
..0..1..0. .0..0..1. .0..1..1. .0..0..0. .0..0..1. .0..1..1. .0..1..1
..1..1..1. .0..0..1. .1..1..1. .0..0..0. .0..0..1. .1..1..1. .1..1..1
..1..1..0. .0..0..0. .0..1..1. .0..1..0. .1..1..1. .1..1..1. .0..1..0
..1..1..1. .1..1..0. .1..1..1. .0..0..0. .1..1..1. .0..0..0. .1..1..1
..0..1..1. .1..1..0. .1..1..1. .0..0..0. .0..1..0. .0..0..0. .1..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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