A196315 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 1,3,0,2,4 for x=0,1,2,3,4

1, 7, 30, 495, 17093, 1313940, 228181579, 88027683663, 75477277195192, 143743832507166333

Offset

1,2

Comments

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

Diagonal of A196322

Links

Table of n, a(n) for n=1..10.

Example

Some solutions for n=4
..0..2..0..0....0..2..0..0....0..0..0..2....0..2..0..0....2..0..2..0
..2..2..0..0....2..2..0..0....0..0..0..0....2..2..0..0....0..2..3..2
..0..0..0..0....0..0..0..0....2..2..2..0....0..0..2..2....0..2..0..0
..0..0..0..0....0..2..2..0....0..0..2..0....2..0..2..0....0..2..0..2

Crossrefs

Sequence in context: A271554 A296013 A196338 * A156347 A221402 A065916

Adjacent sequences: A196312 A196313 A196314 * A196316 A196317 A196318

Keyword

nonn

Author

R. H. Hardin Oct 01 2011

Status

approved