A303887 - OEIS

%I #4 May 02 2018 07:55:21

%S 1,908,684,7433,16431,88901,308271,1437397,5832957,25738579,111298625,

%T 488061118,2160741927,9505071631,42622781668,188580476451,

%U 852064649176,3793761243474,17225448118492,77154233211504,351491360516174

%N Number of nX7 0..1 arrays with every element unequal to 0, 2, 3 or 4 king-move adjacent elements, with upper left element zero.

%C Column 7 of A303888.

%H R. H. Hardin, <a href="/A303887/b303887.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A303888.

%K nonn

%O 1,2

%A _R. H. Hardin_, May 02 2018