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Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without consecutive moves in the same direction
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%I #3 Jan 28 2013 04:13:25

%S 1,1442,109441,14388224,1572414124,180850094177,20435867743591,

%T 2319666884003899,262884477993316833

%N Number of nX4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor, without consecutive moves in the same direction

%C Column 4 of A221873

%e Some solutions for n=3

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

%e ..1..1..0..1....0..3..0..3....2..3..1..1....0..3..1..1....0..4..3..0

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Jan 28 2013