A197200 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,2,1,0,3 for x=0,1,2,3,4

1, 5, 100, 7073, 1890344, 1989885480, 7876891407951, 117490890045317733

Offset

1,2

Comments

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

Diagonal of A197207

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=4
..1..1..2..1....0..0..0..0....1..2..0..0....0..1..2..1....0..0..1..0
..2..0..0..0....0..1..0..0....0..1..0..0....0..0..0..0....0..1..2..0
..1..0..1..0....0..2..1..0....0..0..0..3....1..2..0..3....0..3..0..3
..0..0..2..1....1..2..1..0....0..3..0..0....0..1..0..0....0..0..3..0

Crossrefs

Sequence in context: A141120 A123668 A336427 * A090436 A140616 A087456

Adjacent sequences: A197197 A197198 A197199 * A197201 A197202 A197203

Keyword

nonn

Author

R. H. Hardin Oct 11 2011

Status

approved