A197228


Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,0,1,2 for x=0,1,2,3,4


0


%I
%S 1,7,55,2117,249929,98514881,126615582841,511052139999591
%N Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,3,0,1,2 for x=0,1,2,3,4
%C Every 0 is next to 0 4's, every 1 is next to 1 3's, every 2 is next to 2 0's, every 3 is next to 3 1's, every 4 is next to 4 2's
%C Diagonal of A197235
%e Some solutions for n=4
%e ..0..0..0..0....2..0..0..2....2..0..1..0....0..1..2..0....0..0..0..1
%e ..2..0..0..1....0..0..1..0....0..0..3..1....1..3..0..0....0..0..1..3
%e ..2..0..1..3....2..1..3..1....0..0..1..0....0..1..0..0....0..0..2..1
%e ..0..0..0..1....0..0..0..0....2..0..0..0....2..0..0..0....0..0..0..0
%K nonn
%O 1,2
%A _R. H. Hardin_ Oct 12 2011
