A187138 - OEIS

%I #4 Mar 31 2012 12:36:07

%S 332937,189091422,34994620836,8616423081600,1928394629936928,

%T 456216633873575892

%N Number of (n+1)X8 0..2 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces

%C Column 7 of A187140

%e Some solutions for 4X8

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 05 2011