A196478 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,0,2,1,4 for x=0,1,2,3,4.

1, 6, 40, 826, 40221, 5627727, 1740363958, 1318320614894

Offset

1,2

Comments

Every 0 is next to 0 3'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 4's.

Diagonal of A196485.

Links

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

Example

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

Crossrefs

Cf. A196485.

Sequence in context: A196449 A281262 A186196 * A001367 A096671 A196712

Adjacent sequences: A196475 A196476 A196477 * A196479 A196480 A196481

Keyword

nonn

Author

R. H. Hardin, Oct 03 2011

Status

approved