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%I #5 Jan 26 2013 06:55:23
%S 1,10,41,233,1156,6048,30973,159968,823413,4244066,21863362,112652884,
%T 580406183,2990444375,15407563307,79384245250,409009933399,
%U 2107335620744,10857590040499,55941385316549,288225882117252,1485021507246365
%N Number of nX2 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 2 of A221809
%H R. H. Hardin, <a href="/A221805/b221805.txt">Table of n, a(n) for n = 1..210</a>
%F Empirical: a(n) = a(n-1) +18*a(n-2) +22*a(n-3) -14*a(n-4) -39*a(n-5) -44*a(n-6) -6*a(n-7) +7*a(n-8) +3*a(n-9) +4*a(n-10) +a(n-11)
%e Some solutions for n=3
%e ..0..2....0..1....0..2....1..2....0..1....0..2....1..1....0..2....2..1....1..1
%e ..2..1....2..2....2..1....0..1....1..2....1..2....0..2....2..0....0..0....1..0
%e ..0..1....1..0....1..0....1..1....2..0....0..1....1..1....2..0....1..2....1..2
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 26 2013
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