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A221137 Number of nX6 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.

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%I A221137 #5 Jun 02 2025 08:11:31
%S A221137 16,9801,3485689,1539699121,619901126244,259039174953636,
%T A221137 106295637843093924,43910419047705413284
%N A221137 Number of nX6 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.
%C A221137 Column 6 of A221139
%e A221137 Some solutions for n=3
%e A221137 ..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 A221137 ..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 A221137 ..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 A221137 nonn
%O A221137 1,1
%A A221137 _R. H. Hardin_ Jan 02 2013

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