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%I #4 Jan 25 2013 05:06:28
%S 0,21,536,12177,296912,7115200,170234678,4073986651,97465620298,
%T 2331545530294,55772599075464,1334104002498388,31912076109370226,
%U 763341593404141513,18259216025036326102,436762191877943225707
%N Number of nX5 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without 2-loops or left turns
%C Column 5 of A221768
%H R. H. Hardin, <a href="/A221766/b221766.txt">Table of n, a(n) for n = 1..22</a>
%e Some solutions for n=3
%e ..1..2..2..1..1....0..1..1..1..1....0..1..2..1..1....1..2..1..1..1
%e ..1..1..1..1..1....1..1..2..1..1....1..1..1..0..2....1..2..1..1..1
%e ..0..1..1..1..0....1..1..2..1..0....1..1..1..1..1....0..1..1..1..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 25 2013
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