A204864 - OEIS

%I #5 Mar 31 2012 12:37:03

%S 20113,136899,1013668,7620885,59491439,462259671,3572132537,

%T 27779761123,216129338685,1675476437558,13027242027202,

%U 101268097797410,786267089036436,6110786429125854,47489850472550153,368897712406751027

%N Number of (n+2)X7 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly two different ways, and new values 0..1 introduced in row major order

%C Column 5 of A204867

%H R. H. Hardin, <a href="/A204864/b204864.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 20 2012