A196637 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 1,4,2,0,3 for x=0,1,2,3,4

1, 2, 21, 327, 17518, 2166536, 665532327, 513774394191, 988444898540533, 4764558471777983273

Offset

1,2

Comments

Every 0 is next to 0 1's, every 1 is next to 1 4'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 A196641

Links

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

Example

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

Crossrefs

Sequence in context: A189489 A378099 A196629 * A240997 A241247 A177234

Adjacent sequences: A196634 A196635 A196636 * A196638 A196639 A196640

Keyword

nonn

Author

R. H. Hardin Oct 04 2011

Status

approved