A195970 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,0,1,3,4 for x=0,1,2,3,4.

1, 9, 24, 67, 244, 1280, 5637, 32909, 212185, 1609756, 13476199, 134461394

Offset: 1

Author

R. H. Hardin Sep 25 2011

Keywords

• nonn

Comments

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

Diagonal of A195978

Examples

			Some solutions for n=4
..1..0..0..1....1..2..2..1....1..0..1..1....1..0..1..1....1..0..0..0
..1..0..0..1....0..1..1..0....1..1..1..0....2..1..1..0....2..1..1..1
..1..0..0..1....0..1..1..1....0..1..1..0....2..1..1..0....2..1..1..1
..1..0..0..1....1..1..0..1....0..1..1..0....1..0..1..1....1..0..0..0