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%I #6 Jan 04 2013 12:31:30
%S 0,49,46,9025,58700,2518569,32085376,848789956,14068757692,
%T 311366232004,5733258186854,118412678934081,2273843945394922,
%U 45702294155340601,892403786998151272,17744284197389113081,348794591561701410272
%N Number of 3Xn arrays of occupancy after each element moves to some horizontal, diagonal or antidiagonal neighbor, with no occupancy greater than 2
%C Row 3 of A221200
%H R. H. Hardin, <a href="/A221202/b221202.txt">Table of n, a(n) for n = 1..30</a>
%e Some solutions for n=3
%e ..1..2..1....0..2..1....2..2..0....0..2..0....0..2..0....0..2..1....0..2..1
%e ..1..2..0....0..2..1....0..2..0....1..2..2....1..2..0....1..2..1....0..2..1
%e ..0..2..0....1..2..0....0..2..1....0..2..0....1..2..1....0..2..0....0..2..1
%K nonn
%O 1,2
%A _R. H. Hardin_ Jan 04 2013
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