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%I #4 Jan 26 2013 06:56:46
%S 1,214,3906,197048,6328365,247277805,8830682187,328546555815,
%T 11994407265981,441751061429506,16202916180999264,595448412788077566,
%U 21862647259907974086,803056054269698852052,29491857372420704871557
%N Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without move-in move-out straight through or left turns
%C Column 4 of A221809
%H R. H. Hardin, <a href="/A221807/b221807.txt">Table of n, a(n) for n = 1..27</a>
%e Some solutions for n=3
%e ..1..0..0..2....0..2..1..1....1..0..0..0....1..1..1..1....1..2..0..1
%e ..2..2..1..1....3..0..0..1....2..2..1..2....1..0..0..1....0..1..1..2
%e ..1..1..1..0....1..1..2..0....1..1..1..1....3..1..2..0....1..1..2..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 26 2013