A196473 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,0,3,2,1 for x=0,1,2,3,4.

1, 5, 7, 35, 151, 5955, 299659, 8943355, 528624118, 48720477449

Offset: 1

Author

R. H. Hardin Oct 03 2011

Keywords

• nonn

Comments

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

Diagonal of A196477

Examples

			Some solutions for n=4
..1..0..0..1....0..0..0..0....0..0..1..1....0..0..0..0....0..0..0..1
..1..1..1..1....0..0..0..0....1..1..1..0....1..1..1..1....1..1..1..1
..0..1..1..0....0..0..0..0....1..1..1..1....1..1..1..1....1..1..1..0
..0..1..1..0....1..1..1..1....0..0..0..1....0..0..0..0....0..0..1..1