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A221136 Number of nX5 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.

%I A221136 #6 Jun 02 2025 08:11:24
%S A221136 8,1681,200072,31203396,4235650596,619901126244,86907967843320,
%T A221136 12474883501876324,1766575491615801750,252036106134604983844,
%U A221136 35804312825751223799132,5098360123415675049888964
%N A221136 Number of nX5 arrays of occupancy after each element moves to some horizontal or vertical neighbor, with no occupancy greater than 2.
%C A221136 Column 5 of A221139
%H A221136 R. H. Hardin, <a href="/A221136/b221136.txt">Table of n, a(n) for n = 1..13</a>
%e A221136 Some solutions for n=3
%e A221136 ..0..2..1..2..1....0..1..2..1..2....0..1..2..2..0....0..0..1..2..2
%e A221136 ..1..2..0..1..2....0..0..2..1..2....1..0..1..1..0....2..0..1..2..1
%e A221136 ..0..1..1..0..1....2..2..0..0..0....2..1..2..2..0....2..1..0..1..0
%K A221136 nonn
%O A221136 1,1
%A A221136 _R. H. Hardin_ Jan 02 2013