A221766 - OEIS

%I #4 Jan 25 2013 05:06:28

%S 0,21,536,12177,296912,7115200,170234678,4073986651,97465620298,

%T 2331545530294,55772599075464,1334104002498388,31912076109370226,

%U 763341593404141513,18259216025036326102,436762191877943225707

%N Number of nX5 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without 2-loops or left turns

%C Column 5 of A221768

%H R. H. Hardin, <a href="/A221766/b221766.txt">Table of n, a(n) for n = 1..22</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 25 2013