A197468 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 0,1,0,0,0 for x=0,1,2,3,4

1, 2, 26, 184, 5408, 165200, 16544206, 2117012786, 779857304215, 396015611721478, 546971557228648382

Offset

1,2

Comments

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

Diagonal of A197475

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Sequence in context: A246586 A067851 A072415 * A184354 A178884 A211319

Adjacent sequences: A197465 A197466 A197467 * A197469 A197470 A197471

Keyword

nonn

Author

R. H. Hardin Oct 15 2011

Status

approved