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%I #4 May 25 2012 20:56:07
%S 55,3086,54747,709626,7819020,80249504,792966548,7657995382,
%T 72853584571,685883384889,6408438989184,59535068213979,
%U 550647094657383,5075205382055011,46645202282176349,427714444192049276
%N Number of 0..2 arrays of length 2*n+6 with sum less than 2*n in any length 2n subsequence (=less than 50% duty cycle)
%C Row 7 of A212729
%H R. H. Hardin, <a href="/A212736/b212736.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=3
%e ..0....1....0....2....0....0....1....1....0....0....0....0....0....2....0....0
%e ..2....1....2....1....1....1....0....2....2....2....0....2....1....2....1....1
%e ..0....1....0....0....1....2....0....0....2....1....2....0....1....0....0....1
%e ..2....0....2....1....2....0....0....1....0....0....1....1....1....0....1....0
%e ..1....2....0....0....1....1....2....1....0....0....0....2....1....0....0....1
%e ..0....0....0....0....0....0....1....0....1....0....0....0....0....1....0....1
%e ..0....0....0....0....0....0....0....1....0....1....0....0....1....0....0....1
%e ..1....2....0....1....1....1....0....0....0....1....0....1....0....0....0....0
%e ..1....0....0....0....1....1....0....1....2....1....0....0....0....0....1....1
%e ..1....0....0....1....0....0....1....1....0....0....0....0....2....0....0....0
%e ..0....0....2....1....0....1....0....0....0....2....2....2....0....2....0....1
%e ..2....1....2....0....2....1....0....0....0....0....2....0....2....1....0....2
%K nonn
%O 1,1
%A _R. H. Hardin_ May 25 2012
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