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%I #4 May 28 2018 08:50:36
%S 21,127,121,356,1010,2985,9288,29714,94491,302488,974340,3152830,
%T 10230396,33285406,108488648,354109540,1157319070,3786080477,
%U 12395839066,40611746091,133123022408,436560165995,1432171781602,4699809062692
%N Number of nX7 0..1 arrays with every element unequal to 0, 1, 3, 4 or 8 king-move adjacent elements, with upper left element zero.
%C Column 7 of A305252.
%H R. H. Hardin, <a href="/A305251/b305251.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..1..1..1..1..1..1. .0..0..1..1..1..1..0
%e ..0..0..0..0..0..0..0. .1..1..1..1..1..1..0. .0..0..0..1..1..1..1
%e ..0..0..0..0..0..0..0. .0..0..0..0..0..0..1. .0..0..0..0..1..1..1
%e ..1..0..0..0..1..0..0. .0..1..0..0..0..0..0. .1..0..0..0..0..1..1
%e ..1..1..0..0..0..0..0. .0..0..0..0..0..0..0. .1..1..0..0..0..0..1
%Y Cf. A305252.
%K nonn
%O 1,1
%A _R. H. Hardin_, May 28 2018
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