%I #10 Oct 03 2025 06:26:34

%S 1,5,7,335,3621,193137,13307143,3369153109,1022753961763,

%T 921078606743691

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

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

%C Diagonal of A196287

%e Some solutions for n=4

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_, Sep 30 2011