A197367 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,4,1,0,1 for x=0,1,2,3,4

1, 1, 32, 161, 7485, 509018, 79831388, 27751402365, 20901475723923, 34381589920722561, 123453405715147118697

Offset

1,3

Comments

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

Diagonal of A197373

Links

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

Example

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

Crossrefs

Sequence in context: A299804 A299680 A300312 * A297843 A172191 A304381

Adjacent sequences: A197364 A197365 A197366 * A197368 A197369 A197370

Keyword

nonn

Author

R. H. Hardin Oct 14 2011

Status

approved