A196473 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,0,3,2,1 for x=0,1,2,3,4

1, 5, 7, 35, 151, 5955, 299659, 8943355, 528624118, 48720477449

Offset

1,2

Comments

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

Diagonal of A196477

Links

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

Example

Some solutions for n=4
..1..0..0..1....0..0..0..0....0..0..1..1....0..0..0..0....0..0..0..1
..1..1..1..1....0..0..0..0....1..1..1..0....1..1..1..1....1..1..1..1
..0..1..1..0....0..0..0..0....1..1..1..1....1..1..1..1....1..1..1..0
..0..1..1..0....1..1..1..1....0..0..0..1....0..0..0..0....0..0..1..1

Crossrefs

Sequence in context: A018353 A176958 A196203 * A081851 A342504 A192156

Adjacent sequences: A196470 A196471 A196472 * A196474 A196475 A196476

Keyword

nonn

Author

R. H. Hardin Oct 03 2011

Status

approved