A207435 - OEIS

%I #7 Dec 18 2015 18:18:01

%S 2,16,108,1360,41092,2405923,284247216,68394049216,33064776069834,

%T 31868588102983450,61446275576502856313,236673591523285699197386,

%U 1818567731722871472685169098,27879399799936252965503867197417

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

%C Diagonal of A207442

%H R, H. Hardin, <a href="/A207435/b207435.txt">Table of n, a(n) for n = 1..19</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 17 2012