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A246888
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Number of length n+4 0..4 arrays with some pair in every consecutive five terms totalling exactly 4
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1
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2701, 12481, 57585, 264981, 1216081, 5592169, 25710385, 118192273, 543322645, 2497751105, 11482493485, 52786380721, 242665353541, 1115563238521, 5128382983861, 23575813154485, 108380944031221, 498240685840957
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OFFSET
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1,1
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COMMENTS
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Column 4 of A246892
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LINKS
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R. H. Hardin, Table of n, a(n) for n = 1..210
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FORMULA
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Empirical: a(n) = 3*a(n-1) +6*a(n-2) +5*a(n-3) +17*a(n-4) -16*a(n-5) -117*a(n-6) -174*a(n-7) -295*a(n-8) -478*a(n-9) +437*a(n-10) +1237*a(n-11) +663*a(n-12) +1581*a(n-13) +2542*a(n-14) -1551*a(n-15) -2164*a(n-16) -1754*a(n-17) -1473*a(n-18) +623*a(n-19) +1190*a(n-20) +651*a(n-21) +184*a(n-22) -263*a(n-23) -141*a(n-24) -109*a(n-25) -11*a(n-26) +46*a(n-27) +9*a(n-28) +10*a(n-29) +2*a(n-30) -3*a(n-31)
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EXAMPLE
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Some solutions for n=3
..4....4....4....1....4....4....1....4....4....1....4....4....0....3....3....2
..3....4....3....0....4....3....1....1....4....1....3....4....2....1....2....3
..2....4....1....1....3....0....4....4....2....4....4....0....0....2....3....2
..2....3....4....2....0....4....3....2....1....3....2....1....4....4....1....4
..3....0....0....2....4....2....1....2....2....4....1....0....3....1....3....1
..0....0....3....2....0....0....3....3....3....2....1....4....0....2....4....0
..3....2....0....4....3....0....3....4....1....0....0....0....2....1....1....4
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CROSSREFS
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Sequence in context: A253814 A054561 A230752 * A153513 A333130 A214016
Adjacent sequences: A246885 A246886 A246887 * A246889 A246890 A246891
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KEYWORD
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nonn
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AUTHOR
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R. H. Hardin, Sep 06 2014
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STATUS
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approved
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