%I #7 Dec 18 2015 18:18:03
%S 2,16,72,420,2176,10660,60984,340816,1846240,11076228,66303360,
%T 390426916,2456007216,15586002640,98058552648,645057461220,
%U 4299810563584,28563593727716,195777751059000,1361449965542992,9468978890210480
%N Number of n X n 0..1 arrays avoiding 0 0 0 and 1 1 1 horizontally and 0 0 1 and 1 0 1 vertically
%C Diagonal of A208379
%H R. H. Hardin, <a href="/A208374/b208374.txt">Table of n, a(n) for n = 1..39</a>
%e Some solutions for n=4
%e ..1..1..0..0....1..0..0..1....1..0..0..1....1..1..0..1....1..0..0..1
%e ..1..1..0..0....1..1..0..0....0..1..1..0....1..1..0..1....0..1..0..1
%e ..0..1..0..0....1..1..0..0....0..0..1..0....1..1..0..1....0..1..0..0
%e ..0..1..0..0....1..1..0..0....0..0..1..0....0..1..0..1....0..1..0..0
%K nonn
%O 1,1
%A _R. H. Hardin_ Feb 25 2012
|