A196583 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 3,2,0,1,4 for x=0,1,2,3,4

1, 7, 120, 7407, 1522940, 1051645368, 2443612706889, 18845362559595067

Offset

1,2

Comments

Every 0 is next to 0 3's, every 1 is next to 1 2'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 A196590

Links

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

Example

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

Crossrefs

Sequence in context: A253276 A156955 A196796 * A197041 A283625 A372615

Adjacent sequences: A196580 A196581 A196582 * A196584 A196585 A196586

Keyword

nonn

Author

R. H. Hardin Oct 04 2011

Status

approved