A196712 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,0,2,1,3 for x=0,1,2,3,4

1, 6, 40, 1142, 56137, 9202067, 3464871506, 3526366342860

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

Diagonal of A196718

Links

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

Example

Some solutions for n=4
..0..0..0..1....2..2..0..0....2..2..2..1....1..0..0..1....1..0..1..1
..1..3..1..3....2..2..1..1....2..0..2..0....1..1..1..1....3..1..1..0
..3..1..1..1....0..1..1..3....2..2..2..0....0..1..3..0....1..1..1..0
..1..0..0..0....1..1..0..1....0..0..0..0....0..1..1..0....0..0..1..1

Crossrefs

Sequence in context: A196478 A001367 A096671 * A086803 A136382 A096716

Adjacent sequences: A196709 A196710 A196711 * A196713 A196714 A196715

Keyword

nonn

Author

R. H. Hardin Oct 05 2011

Status

approved