login
Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two
0

%I #3 Jan 14 2013 03:48:31

%S 0,1,4,25,189,1156,6996,43681,268632,1664100,10278914,63568729,

%T 392903168,2429109796

%N Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with every occupancy equal to zero or two

%C Row 4 of A221381

%e All solutions for n=3

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

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

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

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

%K nonn

%O 1,3

%A _R. H. Hardin_ Jan 14 2013