A197161 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,2,1,4,0 for x=0,1,2,3,4

1, 5, 66, 2573, 331406, 135820428, 178698032203, 752158409985973, 10105549470186567265

Offset

1,2

Comments

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

Diagonal of A197167

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Sequence in context: A209935 A156597 A059489 * A059852 A057171 A185230

Adjacent sequences: A197158 A197159 A197160 * A197162 A197163 A197164

Keyword

nonn

Author

R. H. Hardin Oct 10 2011

Status

approved