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A246483
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Number of length 4+3 0..n arrays with no pair in any consecutive four terms totalling exactly n
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1
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2, 28, 644, 3904, 24582, 91212, 317576, 857248, 2174090, 4780060, 10007052, 19154208, 35306894, 61236364, 103134992, 166247872, 261796626, 398879388, 596338580, 868942720, 1246516502, 1751814988, 2429877144, 3314320224
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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) +2*a(n-2) -14*a(n-3) +5*a(n-4) +25*a(n-5) -20*a(n-6) -20*a(n-7) +25*a(n-8) +5*a(n-9) -14*a(n-10) +2*a(n-11) +3*a(n-12) -a(n-13)
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EXAMPLE
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Some solutions for n=6
..6....0....3....2....0....3....0....3....0....2....5....4....6....2....1....1
..6....0....6....2....0....2....1....5....2....6....0....4....5....1....6....4
..4....3....5....5....4....5....4....5....0....2....0....5....6....6....6....0
..6....2....2....6....1....6....4....5....5....5....4....5....2....3....4....3
..5....1....3....6....3....2....4....3....5....2....0....0....3....6....4....0
..5....2....2....3....1....6....0....4....5....6....0....4....5....4....5....0
..6....2....2....2....4....6....3....4....0....6....3....3....5....6....6....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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