A197799 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,2,1,0,1 for x=0,1,2,3,4

1, 5, 102, 7185, 1944779, 2076384112, 8356101105886, 127186506081050671

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 1's

Diagonal of A197805

Links

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

Example

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

Crossrefs

Sequence in context: A260024 A123626 A210900 * A266903 A052138 A308459

Adjacent sequences: A197796 A197797 A197798 * A197800 A197801 A197802

Keyword

nonn

Author

R. H. Hardin Oct 18 2011

Status

approved