A197496 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,3,1,1,0 for x=0,1,2,3,4

1, 1, 22, 181, 7845, 755338, 182232300, 122868970059, 214646199763320

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

Diagonal of A197503

Links

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

Example

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

Crossrefs

Sequence in context: A041932 A125359 A126517 * A107969 A248489 A372996

Adjacent sequences: A197493 A197494 A197495 * A197497 A197498 A197499

Keyword

nonn

Author

R. H. Hardin Oct 15 2011

Status

approved