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A299047
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Number of n X 3 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.
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1
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3, 4, 11, 40, 79, 480, 1542, 5317, 22571, 80346, 297210, 1158279, 4266972, 16017750, 60820802, 227040843, 853970252, 3218688708, 12071422085, 45398669314, 170767134707, 641450486645, 2411776993812, 9067212243589, 34076147843251
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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) +5*a(n-2) +21*a(n-3) -39*a(n-4) -61*a(n-5) -56*a(n-6) +110*a(n-7) +183*a(n-8) +50*a(n-9) -27*a(n-10) -125*a(n-11) -64*a(n-12) -141*a(n-13) +36*a(n-14) +5*a(n-15) +8*a(n-16) +6*a(n-17) for n>18.
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EXAMPLE
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Some solutions for n=5
..0..1..0. .0..0..0. .0..1..1. .0..0..0. .0..1..1. .0..1..1. .0..0..1
..1..1..1. .0..0..0. .0..1..1. .0..0..0. .0..1..1. .0..1..1. .0..0..0
..1..1..1. .1..1..0. .0..0..0. .1..0..1. .0..0..0. .1..1..1. .0..1..0
..0..0..1. .0..0..0. .0..1..1. .0..0..0. .0..0..0. .1..1..0. .0..0..0
..0..0..1. .0..0..0. .0..1..1. .1..0..0. .1..0..1. .1..1..0. .0..0..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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