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Number of nX7 0..1 arrays with every element unequal to 0, 1, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1

%I #4 Aug 24 2018 11:11:54

%S 21,30,71,106,279,842,2429,7451,22996,70762,218768,677035,2090867,

%T 6478680,20058184,62168555,192733963,597744210,1854283003,5753186642,

%U 17852343400,55399248790,171922042756,533541165687,1655798511324

%N Number of nX7 0..1 arrays with every element unequal to 0, 1, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Column 7 of A318350.

%H R. H. Hardin, <a href="/A318349/b318349.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A318350.

%K nonn

%O 1,1

%A _R. H. Hardin_, Aug 24 2018