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%I #4 Jan 24 2013 08:08:14
%S 0,8,1,241,748,16715,117067,1557684,14265803,161569614,1620282797,
%T 17408729025,179900894011,1900169117498,19826703745763,
%U 208284274385624,2179869985099525,22861530838829623,239488491429326898
%N Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns
%C Row 4 of A221755
%H R. H. Hardin, <a href="/A221758/b221758.txt">Table of n, a(n) for n = 1..26</a>
%e Single solution for n=3
%e ..0..2..1
%e ..1..2..0
%e ..0..2..1
%e ..1..2..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 24 2013