A197882 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 0,2,1,1,1 for x=0,1,2,3,4

1, 4, 6, 155, 2730, 129294, 13253562, 2512321052

Offset

1,2

Comments

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

Diagonal of A197889

Links

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

Example

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

Crossrefs

Sequence in context: A355230 A070155 A280778 * A074124 A303161 A070156

Adjacent sequences: A197879 A197880 A197881 * A197883 A197884 A197885

Keyword

nonn

Author

R. H. Hardin Oct 19 2011

Status

approved