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Number of length 6+2 0..n arrays with no three consecutive terms having the sum of any two elements equal to twice the third
1

%I #4 Oct 06 2014 19:20:32

%S 68,576,14040,96736,520788,1952254,6493036,17917712,45541888,

%T 102869198,219106196,433633802,820820502,1471721904,2552955354,

%U 4256615846,6910769098,10880058248,16766422418,25217401274,37267800170,53987521754

%N Number of length 6+2 0..n arrays with no three consecutive terms having the sum of any two elements equal to twice the third

%C Row 6 of A248461

%H R. H. Hardin, <a href="/A248467/b248467.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..2....1....3....0....3....2....3....1....0....4....4....4....2....1....4....3

%e ..3....0....0....0....4....3....1....1....0....0....3....0....4....3....0....2

%e ..2....3....4....2....1....3....1....3....4....4....3....3....2....3....1....0

%e ..0....0....3....0....1....0....0....4....4....1....1....4....4....0....1....0

%e ..2....3....3....3....0....0....3....0....0....4....4....4....4....2....2....3

%e ..3....4....0....1....1....1....4....1....0....1....0....3....1....2....4....1

%e ..3....0....0....4....1....3....4....3....3....3....1....0....1....0....2....0

%e ..1....0....2....3....2....1....2....0....4....3....1....0....3....0....1....4

%K nonn

%O 1,1

%A _R. H. Hardin_, Oct 06 2014