A221927 - OEIS

%I #4 Feb 01 2013 05:07:03

%S 13,2197,201378,20246283,2007184132,199492714651,19816266524892,

%T 1968651817039048,195572208446932549,19428830291892380296,

%U 1930127245301117267451,191745542191155118363255

%N Number of nX4 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor, without move-in move-out straight through or left turns

%C Column 4 of A221929

%H R. H. Hardin, <a href="/A221927/b221927.txt">Table of n, a(n) for n = 1..49</a>

%e Some solutions for n=3

%e ..0..3..1..3....0..1..4..0....0..1..0..2....0..0..1..0....0..2..2..0

%e ..0..0..0..0....0..2..0..0....3..3..0..0....0..2..3..0....0..0..1..1

%e ..2..0..2..1....0..4..0..1....0..0..2..1....3..0..2..1....0..3..2..1

%K nonn

%O 1,1

%A _R. H. Hardin_ Feb 01 2013