A221417 - OEIS

%I #4 Jan 15 2013 20:07:29

%S 8,242,6798,193809,5501288,156275181,4438212854,126047555332,

%T 3579725111162,101663058496174,2887188399895922,81994856978729880,

%U 2328615956549861402,66131601824729724429,1878106344412444059646

%N Number of nX6 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two

%C Column 6 of A221419

%H R. H. Hardin, <a href="/A221417/b221417.txt">Table of n, a(n) for n = 1..16</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 15 2013