A207777 - OEIS

%I #5 Mar 31 2012 12:37:19

%S 31,961,2040,20104,157472,759482,6513576,49975640,259077468,

%T 2150453548,15981869071,87310201135,709311394273,5137197417469,

%U 29284543214864,233502033554208,1657717100658198,9791967204391982,76739391151731042

%N Number of 7Xn 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 0 1 0 vertically

%C Row 7 of A207774

%H R. H. Hardin, <a href="/A207777/b207777.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 20 2012