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Number of nX6 0..1 arrays with every element unequal to 2, 3 or 4 king-move adjacent elements, with upper left element zero.
1

%I #4 Apr 28 2018 09:33:18

%S 0,209,108,1744,2809,19068,55382,273621,934066,4202604,15472710,

%T 66178236,253206464,1054639996,4118641264,16900720621,66776102270,

%U 271648054383,1080722426035,4373896909559,17472759594897,70501053021557

%N Number of nX6 0..1 arrays with every element unequal to 2, 3 or 4 king-move adjacent elements, with upper left element zero.

%C Column 6 of A303690.

%H R. H. Hardin, <a href="/A303688/b303688.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A303690.

%K nonn

%O 1,2

%A _R. H. Hardin_, Apr 28 2018