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%I #4 Jan 06 2013 19:53:42
%S 16,2500,488601,103489929,22466712321,4919350997521,1080371161000000,
%T 237502965724417600,52227958295629168900,11486303574511411132081,
%U 2526218624607638969433649,555604441977129578423379025
%N Number of nX6 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2
%C Column 6 of A221255
%H R. H. Hardin, <a href="/A221253/b221253.txt">Table of n, a(n) for n = 1..13</a>
%e Some solutions for n=3
%e ..0..1..2..2..1..2....0..1..2..1..2..1....0..2..2..0..2..2....0..2..2..1..0..1
%e ..1..1..1..1..1..0....0..2..1..1..2..0....0..2..1..1..2..1....0..1..1..1..2..0
%e ..0..1..2..1..1..0....1..1..0..1..1..1....0..1..0..0..2..0....0..2..2..0..2..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Jan 06 2013