A317822 - OEIS

%I #4 Aug 07 2018 22:08:09

%S 8,1634,3150,48526,179111,1458418,7370716,49813114,285365386,

%T 1801862295,10780737885,66250927857,402362478261,2454261649360,

%U 14947185490935,91152367042211,554926695836229,3385228443629637,20612211780845789

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

%C Column 7 of A317823.

%H R. H. Hardin, <a href="/A317822/b317822.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A317823.

%K nonn

%O 1,1

%A _R. H. Hardin_, Aug 07 2018