A207248 - OEIS

%I #7 Dec 18 2015 18:18:00

%S 2,16,102,940,9072,101036,1231650,16436824,237255370,3684061372,

%T 61152471648,1079792961548,20191392448058,398344602963240,

%U 8263930584283206,179759826117751524,4089350929606635216

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

%C Diagonal of A207254

%H R. H. Hardin, <a href="/A207248/b207248.txt">Table of n, a(n) for n = 1..70</a>

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 16 2012