A196960 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,1,2,0,3 for x=0,1,2,3,4

1, 6, 101, 5465, 1210968, 906566345, 2383058555507, 22106903739199918

Offset

1,2

Comments

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

Diagonal of A196967

Links

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

Example

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

Crossrefs

Sequence in context: A196726 A197066 A266683 * A218462 A065990 A306406

Adjacent sequences: A196957 A196958 A196959 * A196961 A196962 A196963

Keyword

nonn

Author

R. H. Hardin Oct 08 2011

Status

approved