A196944 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,1,0,2,3 for x=0,1,2,3,4

1, 11, 210, 18060, 5039158, 4998342821, 17331168379114, 210721221635883326

Offset

1,2

Comments

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

Diagonal of A196950

Links

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

Example

Some solutions for n=4
..0..0..0..2....0..0..0..0....0..1..1..0....0..0..1..1....2..0..1..1
..0..1..1..0....0..0..1..1....0..0..2..1....1..1..2..0....0..0..0..2
..0..0..2..0....1..0..0..0....0..0..0..1....0..0..0..1....0..0..0..0
..2..0..2..0....1..0..1..1....1..1..2..0....2..0..0..1....0..0..1..1

Crossrefs

Sequence in context: A060496 A280072 A157691 * A112386 A160693 A167442

Adjacent sequences: A196941 A196942 A196943 * A196945 A196946 A196947

Keyword

nonn

Author

R. H. Hardin Oct 08 2011

Status

approved