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%I #4 Jan 30 2013 19:15:45
%S 0,0,0,202,2722,31881,416630,5496803,71900708,940934266,12320347932,
%T 161293030438,2111496138082,27642157184325,361871500036368,
%U 4737358281430753,62018044719943396,811895156827216792
%N Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, without 2-loops or left turns
%C Row 3 of A221890
%H R. H. Hardin, <a href="/A221892/b221892.txt">Table of n, a(n) for n = 1..70</a>
%e Some solutions for n=4
%e ..0..1..1..0....0..1..1..1....0..2..1..1....0..3..2..1....0..3..2..0
%e ..0..2..3..1....0..1..3..0....0..2..2..0....1..1..2..0....1..1..1..1
%e ..1..2..1..0....1..3..1..0....1..1..2..0....0..1..1..0....0..1..2..0
%K nonn
%O 1,4
%A _R. H. Hardin_ Jan 30 2013
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