A197523 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,4,1,0,1 for x=0,1,2,3,4

1, 1, 32, 289, 26282, 4538784, 2095251333, 2629509487169, 9372400936796449, 87780282753696748644

Offset

1,3

Comments

Every 0 is next to 0 4'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 A197529

Links

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

Example

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

Crossrefs

Sequence in context: A317609 A251782 A267324 * A337418 A283546 A297685

Adjacent sequences: A197520 A197521 A197522 * A197524 A197525 A197526

Keyword

nonn

Author

R. H. Hardin Oct 16 2011

Status

approved