A222515 - OEIS

%I #4 Feb 23 2013 17:13:03

%S 0,144,1335,15420,128889,2220730,19892241,385142640,3707833063,

%T 76288704212,767768563690,16265595620923,167593171246145,

%U 3601551682848558,37565287343451014,813220525871238420

%N Number of 7Xn 0..1 arrays with exactly floor(7Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order

%C Row 7 of A222509

%H R. H. Hardin, <a href="/A222515/b222515.txt">Table of n, a(n) for n = 1..17</a>

%e Some solutions for n=3

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

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

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 23 2013