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Number of nX6 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2
0

%I #3 Jan 02 2013 19:46:43

%S 16,9801,3485689,1539699121,619901126244,259039174953636,

%T 106295637843093924,43910419047705413284

%N Number of nX6 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2

%C Column 6 of A221139

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 02 2013