A197443 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,1,1,0,0 for x=0,1,2,3,4.

1, 5, 81, 4837, 1108699, 982926107, 3148323076125, 37516007592943532, 1657994465210882573048

Offset: 1

Author

R. H. Hardin Oct 15 2011

Keywords

• nonn

Comments

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

Diagonal of A197450

Examples

			Some solutions containing all values 0 to 4 for n=4
..0..3..0..0....2..1..1..0....0..1..1..2....0..0..3..0....2..1..1..0
..1..0..4..0....1..0..0..3....0..0..0..1....0..4..0..1....1..0..0..3
..1..0..0..3....1..0..4..0....0..4..0..1....0..0..0..1....1..0..4..0
..2..1..1..0....0..0..0..0....0..0..3..0....0..1..1..2....0..3..0..0