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%I #4 Oct 06 2014 16:45:17
%S 2,9,52,389,1014,2021,3200,5589,8218,11401,14696,18947,23274,27861,
%T 32772,39481,46246,53633,61036,69369,77910,86569,95228,105879,116826,
%U 127859,139132,150965,162798,175561,188324,203137,218098,233121,248604,265287
%N Number of length 7+2 0..n arrays with every three consecutive terms having the sum of some two elements equal to twice the third
%C Row 7 of A248433
%H R. H. Hardin, <a href="/A248440/b248440.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=6
%e ..4....2....1....3....3....6....5....1....4....5....1....6....3....2....4....2
%e ..0....0....0....2....4....4....3....2....2....1....0....5....4....3....2....6
%e ..2....4....2....4....5....5....1....3....0....3....2....4....5....4....6....4
%e ..4....2....1....3....3....3....5....1....4....2....1....3....3....2....4....5
%e ..0....3....0....2....4....1....3....2....2....4....0....5....4....0....5....3
%e ..2....4....2....1....5....2....4....0....6....3....2....1....2....1....6....4
%e ..1....2....4....3....3....3....5....4....4....2....4....3....3....2....4....2
%e ..3....3....6....5....4....4....3....2....2....1....6....5....4....0....2....0
%e ..5....4....2....4....5....5....4....0....3....3....5....4....5....4....6....1
%K nonn
%O 1,1
%A _R. H. Hardin_, Oct 06 2014
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