A318090 - OEIS

%I #4 Aug 16 2018 10:22:34

%S 1,23,15,1976,8525,68301,504606,4057433,31285292,240249513,1835199684,

%T 14224588572,109059566554,843075304556,6476620099640,49958130687711,

%U 384425885605155,2962333140940211,22808849182759504,175696908902774160

%N Number of nX7 0..1 arrays with every element unequal to 0, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

%C Column 7 of A318091.

%H R. H. Hardin, <a href="/A318090/b318090.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=5

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

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

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

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

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

%Y Cf. A318091.

%K nonn

%O 1,2

%A _R. H. Hardin_, Aug 16 2018