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Number of nX7 0..1 arrays with every element unequal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1

%I #4 Aug 12 2018 19:36:38

%S 64,4105,37700,603215,7960400,109443619,1493271874,20443576030,

%T 279709797313,3828247661823,52400061484204,717264682586055,

%U 9818436168350577,134403118254988711,1839845040971963605

%N Number of nX7 0..1 arrays with every element unequal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Column 7 of A318016.

%H R. H. Hardin, <a href="/A318015/b318015.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A318016.

%K nonn

%O 1,1

%A _R. H. Hardin_, Aug 12 2018