A221674 - OEIS

%I #4 Jan 21 2013 18:11:25

%S 2,27,400,5741,81910,1165913,16583044,235810525,3352967744,

%T 47674475534,677859111916,9638113778155,137039061732784,

%U 1948482984616486,27704405262039888,393913655872817605,5600840943900558440

%N Number of nX3 arrays of occupancy after each element moves to some horizontal or vertical neighbor, without move-in move-out left turns

%C Column 3 of A221676

%H R. H. Hardin, <a href="/A221674/b221674.txt">Table of n, a(n) for n = 1..97</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 21 2013