The OEIS is supported by the many generous donors to the OEIS Foundation.
%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