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Number of nX6 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2

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`%I #4 Jan 11 2013 05:32:38
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`%S 99,46211,22181855,10794156688,5264460642473,2568131772343102,
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`%T 1252783082725664892,611119758365760669838,298107197445873504485520,
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`%U 145417480551629396888700687,70934889022803306796027176575
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`%N Number of nX6 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, with no occupancy greater than 2
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`%C Column 6 of A221328
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`%H R. H. Hardin, <a href="/A221326/b221326.txt">Table of n, a(n) for n = 1..16</a>
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`%e Some solutions for n=3
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`%e ..0..1..1..1..0..1....0..1..2..2..0..0....0..1..2..0..2..1....0..1..2..1..1..1
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`%e ..0..2..2..2..1..0....0..2..1..1..1..2....0..1..2..2..2..0....0..1..1..2..1..0
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`%e ..0..1..2..1..1..2....0..1..1..2..1..1....0..2..0..0..1..2....0..2..2..2..0..1
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`%K nonn
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`%O 1,1
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`%A _R. H. Hardin_ Jan 11 2013
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