A196780 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,4,3,0,1 for x=0,1,2,3,4

1, 1, 17, 145, 6137, 404589, 65282256, 22331701461, 16774271567427, 27461523421500033, 98038364298327333400

Offset

1,3

Comments

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

Diagonal of A196786

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Sequence in context: A233328 A364155 A083294 * A208506 A299599 A244852

Adjacent sequences: A196777 A196778 A196779 * A196781 A196782 A196783

Keyword

nonn

Author

R. H. Hardin Oct 06 2011

Status

approved