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A222017 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without move-in move-out straight through or left turns.

%I A222017 #6 Jul 23 2025 02:22:42
%S A222017 13,1363,86088,5925053,403317044,27460842224,1870475750419,
%T A222017 127385479747138,8675741759311142,590866503322144180,
%U A222017 40241368935424750183,2740665723881270704902,186654894043998446085330
%N A222017 Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal or vertical neighbor, without move-in move-out straight through or left turns.
%C A222017 Column 4 of A222020
%H A222017 R. H. Hardin, <a href="/A222017/b222017.txt">Table of n, a(n) for n = 1..131</a>
%e A222017 Some solutions for n=3
%e A222017 ..1..0..1..1....0..3..1..2....1..0..0..1....0..1..2..0....2..2..2..2
%e A222017 ..0..3..1..2....0..0..0..0....1..4..0..3....2..1..2..0....0..0..0..0
%e A222017 ..1..1..0..1....2..1..3..0....0..1..1..0....2..0..2..0....1..1..0..2
%K A222017 nonn
%O A222017 1,1
%A A222017 _R. H. Hardin_ Feb 05 2013