A196131 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 0,2,1,3,4 for x=0,1,2,3,4.

1, 4, 4, 31, 326, 3716, 75720, 2040678, 86632050, 5257705657

Offset: 1

Author

R. H. Hardin Sep 28 2011

Keywords

• nonn

Comments

Every 0 is next to 0 0's, every 1 is next to 1 2'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 A196138

Examples

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