A196309 Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,0,4,1,3 for x=0,1,2,3,4

1, 5, 7, 335, 3349, 184217, 11575179, 2915102103, 766706823953, 662820784405591

Offset

1,2

Comments

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

Diagonal of A196314

Links

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

Example

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

Crossrefs

Sequence in context: A229030 A229033 A187022 * A196281 A196331 A344361

Adjacent sequences: A196306 A196307 A196308 * A196310 A196311 A196312

Keyword

nonn

Author

R. H. Hardin Oct 01 2011

Status

approved