A207900 - OEIS

%I #5 Mar 31 2012 12:37:20

%S 42,1764,8928,47320,231900,1153532,5888458,29719004,148308700,

%T 747498440,3783114924,19018273952,95539877180,481930389188,

%U 2429549328924,12220600155324,61525298964898,310087031694592,1561597935502608

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

%C Row 7 of A207895

%H R. H. Hardin, <a href="/A207900/b207900.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

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

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

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

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 21 2012