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%I #4 Feb 04 2016 22:04:30
%S 8,64,505,3977,31276,245626,1926444,15089356,118040270,922247248,
%T 7196716310,56092274904,436681564144,3395712755366,26376195676360,
%U 204653424502050,1586213921445534,12281469122143732,94993604706706795
%N Number of length-n 0..7 arrays with no adjacent pair x,x+1 followed at any distance by x+1,x.
%C Column 7 of A268457.
%H R. H. Hardin, <a href="/A268456/b268456.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=5
%e ..7....2....3....3....6....4....5....4....1....0....6....7....6....4....2....4
%e ..6....5....2....6....5....4....1....1....6....2....1....4....5....1....4....1
%e ..4....4....1....4....0....5....3....0....4....4....7....5....0....3....7....7
%e ..5....4....1....5....1....0....4....7....3....2....2....3....7....4....3....0
%e ..2....0....1....1....6....6....0....6....6....1....6....6....7....4....2....4
%Y Cf. A268457.
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 04 2016
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