A197343 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,3,1,1,0 for x=0,1,2,3,4

1, 1, 18, 441, 17577, 2036994, 617973077, 434261782615, 734428231903592

Offset

1,3

Comments

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

Diagonal of A197350

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A005477 A361549 A326368 * A289941 A254211 A086501

Adjacent sequences: A197340 A197341 A197342 * A197344 A197345 A197346

Keyword

nonn

Author

R. H. Hardin Oct 13 2011

Status

approved