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A302815
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Number of n X 3 0..1 arrays with every element equal to 0, 1, 2, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
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1
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4, 20, 75, 389, 1852, 8485, 41247, 196946, 931243, 4464289, 21314416, 101500589, 484945365, 2314846870, 11042132315, 52714123333, 251602109008, 1200668947009, 5730793024341, 27351896253430, 130538870872807, 623034403841625
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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) +5*a(n-2) +36*a(n-3) -62*a(n-4) -116*a(n-5) -142*a(n-6) -78*a(n-7) +150*a(n-8) -100*a(n-9) +176*a(n-10) +272*a(n-11) +320*a(n-12) -256*a(n-14).
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EXAMPLE
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Some solutions for n=5
..0..0..1. .0..0..1. .0..1..1. .0..1..0. .0..1..0. .0..0..0. .0..0..1
..0..1..1. .1..1..0. .1..0..0. .1..1..1. .0..0..1. .0..1..0. .1..1..0
..1..1..1. .0..0..0. .1..0..1. .1..0..1. .0..1..1. .0..1..1. .0..1..0
..1..0..1. .0..0..0. .1..0..1. .0..0..1. .0..1..0. .0..0..0. .1..0..0
..0..0..0. .1..1..1. .1..0..0. .1..1..0. .0..0..0. .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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