A196689 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,1,3,0,4 for x=0,1,2,3,4

1, 5, 76, 3394, 546956, 279754939, 465819437152, 2520182960610600, 44155322347113863050, 2500562115488233367551895

Offset

1,2

Comments

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

Diagonal of A196696

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A011918 A209095 A136300 * A196725 A197063 A144997

Adjacent sequences: A196686 A196687 A196688 * A196690 A196691 A196692

Keyword

nonn

Author

R. H. Hardin Oct 05 2011

Status

approved