A196487 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,3,0,1,4 for x=0,1,2,3,4.

1, 1, 9, 99, 2862, 188603, 28338246, 10179007465, 8440119388684, 16385876855589022, 74005549246712939357, 780142920501811666245635

Offset

1,3

Comments

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

Diagonal of A196493

Links

Table of n, a(n) for n=1..12.

Example

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

Crossrefs

Sequence in context: A070068 A068668 A035027 * A262540 A265203 A078238

Adjacent sequences: A196484 A196485 A196486 * A196488 A196489 A196490

Keyword

nonn

Author

R. H. Hardin, Oct 03 2011

Status

approved