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A268748 Number of nX6 binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once. 1

%I #4 Feb 12 2016 12:32:43

%S 41,659,10830,165019,2425799,34732937,487682438,6746117783,

%T 92215499119,1248437108837,16766958502992,223674635599161,

%U 2966748789292217,39154974765661223,514529476985579624,6735601878829825279

%N Number of nX6 binary arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.

%C Column 6 of A268750.

%H R. H. Hardin, <a href="/A268748/b268748.txt">Table of n, a(n) for n = 1..210</a>

%F Empirical: a(n) = 16*a(n-1) +60*a(n-2) -1148*a(n-3) -3346*a(n-4) +16272*a(n-5) +36588*a(n-6) -104246*a(n-7) -147989*a(n-8) +349140*a(n-9) +217324*a(n-10) -591448*a(n-11) -19320*a(n-12) +431032*a(n-13) -151921*a(n-14) -73194*a(n-15) +41684*a(n-16) +2552*a(n-17) -3594*a(n-18) +148*a(n-19) +100*a(n-20) -4*a(n-21) -a(n-22)

%e Some solutions for n=4

%e ..0..0..1..1..0..0. .1..0..1..0..1..0. .0..0..0..1..0..1. .0..1..0..0..0..1

%e ..0..1..0..0..0..1. .0..0..0..1..0..0. .0..0..0..1..0..0. .0..0..1..0..1..0

%e ..0..0..1..0..1..0. .0..1..0..0..0..0. .1..0..0..0..0..0. .0..0..0..1..0..0

%e ..0..1..0..1..0..0. .0..1..0..0..0..1. .0..0..1..0..1..0. .1..0..1..0..0..1

%Y Cf. A268750.

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 12 2016

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Last modified April 24 10:11 EDT 2024. Contains 371935 sequences. (Running on oeis4.)