A217342 - OEIS

%I #4 Oct 01 2012 06:04:01

%S 0,38,2389,120908,5756974,267947653,12350550690,566789163488,

%T 25958450760849,1187754678765443,54322924296499637,

%U 2483989094275943631,113572728843260660640,5192525516036292143928,237396286736491907178433

%N Number of nX4 arrays of occupancy after each element moves to some horizontal or vertical neighbor but without 2-loops

%C Column 4 of A217346

%H R. H. Hardin, <a href="/A217342/b217342.txt">Table of n, a(n) for n = 1..43</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Oct 01 2012