login
1/3 the number of nX8 0..2 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors
0

%I #6 Mar 31 2012 12:36:02

%S 43,63544,29168100,15594228288,7976049592892,4170998760222200,

%T 2159859526859795892

%N 1/3 the number of nX8 0..2 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors

%C Column 8 of A185559

%e Some solutions for 4X8 with a(1,1)=0

%e ..0..0..0..1..2..2..2..2....0..0..0..1..0..2..2..2....0..0..0..1..1..0..0..0

%e ..0..1..0..1..2..0..0..2....0..1..0..1..0..0..1..1....0..1..0..1..2..2..2..0

%e ..0..1..0..1..0..1..2..2....0..1..0..1..2..2..2..1....0..1..0..1..0..0..1..1

%e ..0..0..0..1..0..1..0..0....0..0..0..1..1..1..2..1....0..0..0..1..1..2..2..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 31 2011