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A242581
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Number of length n+3 0..5 arrays with no four elements in a row with pattern aabb (with a!=b) and new values 0..5 introduced in 0..5 order
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1
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14, 46, 175, 744, 3453, 17178, 90033, 489821, 2734513, 15534111, 89271482, 516935609, 3008249095, 17562798942, 102750973652, 601965097333, 3529737223262, 20709247799845, 121548480504365, 713577294998844
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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) = 16*a(n-1) -106*a(n-2) +425*a(n-3) -1284*a(n-4) +3083*a(n-5) -5823*a(n-6) +9091*a(n-7) -11623*a(n-8) +11784*a(n-9) -9883*a(n-10) +6151*a(n-11) -2730*a(n-12) +900*a(n-13)
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EXAMPLE
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Some solutions for n=4
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..0....1....1....1....1....1....1....1....1....1....1....1....1....0....1....0
..1....1....2....2....2....0....0....2....0....2....1....0....1....1....1....1
..2....1....0....3....3....1....2....3....0....2....1....0....2....0....2....0
..3....1....1....4....3....0....2....2....1....0....2....0....3....2....0....1
..2....2....2....5....1....2....2....1....0....2....3....1....1....3....2....2
..0....1....3....4....4....2....0....3....2....1....1....0....1....1....2....3
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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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