A208500 - OEIS

%I #5 Mar 31 2012 12:37:23

%S 42,1764,1728,5436,13806,37430,111328,286754,844200,2336928,6407688,

%T 18684540,50681028,145645192,408090270,1135228896,3261392100,

%U 8999952300,25648313760,72191962584,201563085152,574718422958,1602200548928

%N Number of nX7 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 1 0 and 1 1 1 vertically

%C Column 7 of A208501

%H R. H. Hardin, <a href="/A208500/b208500.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 27 2012