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A246898 Number of length 6+4 0..n arrays with some pair in every consecutive five terms totalling exactly n 1

%I #4 Sep 06 2014 15:50:37

%S 802,48393,643204,5592169,26346486,107053441,319477960,884303793,

%T 2058978250,4577948761,9125970252,17627483353,31593727774,55331109009,

%U 91774208656,149536831201,233808185970,360429285673,537940839700

%N Number of length 6+4 0..n arrays with some pair in every consecutive five terms totalling exactly n

%C Row 6 of A246892

%H R. H. Hardin, <a href="/A246898/b246898.txt">Table of n, a(n) for n = 1..63</a>

%F Empirical: a(n) = 2*a(n-1) +6*a(n-2) -14*a(n-3) -14*a(n-4) +42*a(n-5) +14*a(n-6) -70*a(n-7) +70*a(n-9) -14*a(n-10) -42*a(n-11) +14*a(n-12) +14*a(n-13) -6*a(n-14) -2*a(n-15) +a(n-16)

%e Some solutions for n=2

%e ..0....0....2....0....2....1....0....1....1....0....1....2....2....0....1....0

%e ..2....2....0....0....1....1....0....0....0....2....0....2....0....1....1....2

%e ..2....0....0....1....2....2....0....1....1....2....0....0....0....2....1....2

%e ..0....1....0....0....2....1....1....0....0....2....2....1....1....0....1....2

%e ..1....1....2....2....1....1....2....2....1....0....2....1....1....0....1....0

%e ..0....2....0....2....1....2....1....0....2....2....0....1....0....2....0....2

%e ..2....1....0....0....1....0....1....2....1....1....0....2....0....0....2....1

%e ..0....0....2....2....2....0....2....0....0....2....2....2....0....0....2....2

%e ..2....0....2....0....1....0....1....0....1....1....2....0....2....2....1....1

%e ..1....0....1....2....2....1....1....1....0....2....2....2....2....0....2....1

%K nonn

%O 1,1

%A _R. H. Hardin_, Sep 06 2014

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Last modified August 13 21:35 EDT 2024. Contains 375144 sequences. (Running on oeis4.)