%I #7 May 23 2013 07:06:38
%S 0,3,5,16,41,105,288,735,1981,5156,13685,35973,94940,250271,659721,
%T 1739740,4585933,12092245,31878636,84050611,221594145,584232168,
%U 1540316025
%N Number of nX4 arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, without 2-loops or left turns
%C Column 4 of A221787
%F Empirical: a(n) = 5*a(n-2) + 5*a(n-3) + a(n-5). - _Vaclav Kotesovec_, May 23 2013
%e All solutions for n=3
%e ..0..2..2..1....0..1..1..1....0..2..2..1....0..2..1..1....0..2..2..1
%e ..0..2..2..0....0..2..2..0....0..2..1..0....0..1..2..0....0..1..1..0
%e ..1..1..1..0....1..2..2..0....1..1..2..0....1..2..2..0....1..2..2..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 25 2013