%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