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A268456 Number of length-n 0..7 arrays with no adjacent pair x,x+1 followed at any distance by x+1,x. 1

%I

%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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Last modified June 27 10:04 EDT 2022. Contains 354896 sequences. (Running on oeis4.)