A197273 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,0,1,1,1 for x=0,1,2,3,4.

1, 9, 34, 627, 16890, 1276986, 209785488, 84453386767, 71088592371829

Offset: 1

Author

R. H. Hardin, Oct 12 2011

Keywords

• nonn
• more
• changed

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 1's, every 4 is next to 4 1's.

Examples

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

Crossrefs

Diagonal of A197280.