A196944 - OEIS

%I #6 Dec 18 2015 18:17:48

%S 1,11,210,18060,5039158,4998342821,17331168379114,210721221635883326

%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 4,1,0,2,3 for x=0,1,2,3,4

%C Every 0 is next to 0 4's, every 1 is next to 1 1's, every 2 is next to 2 0's, every 3 is next to 3 2's, every 4 is next to 4 3's

%C Diagonal of A196950

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Oct 08 2011