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Number of nX3 arrays of occupancy after each element stays put or moves to some king-move neighbor, without move-in move-out straight through or left turns
0

%I #3 Jan 31 2013 18:15:35

%S 6,350,13228,508281,19513309,749481703,28788205897,1105748138634,

%T 42471447510183,1631315682219574

%N Number of nX3 arrays of occupancy after each element stays put or moves to some king-move neighbor, without move-in move-out straight through or left turns

%C Column 3 of A221925

%e Some solutions for n=3

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

%e ..2..1..2....0..0..0....3..2..0....2..0..0....5..0..0....3..2..0....2..1..1

%e ..1..0..1....4..0..1....0..1..2....0..2..1....0..2..0....0..2..0....1..1..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Jan 31 2013