%I #4 Jan 26 2013 07:11:43

%S 1,91,1041,29412,574706,13076919,280280821,6157362467,133971367251,

%T 2926556131807,63829507756107,1393042238694910,30394642476262010,

%U 663246016374693512,14472196608372584944,315792262364985554100

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

%C Column 4 of A221817

%H R. H. Hardin, <a href="/A221815/b221815.txt">Table of n, a(n) for n = 1..30</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 26 2013