

A197200


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


0




OFFSET

1,2


COMMENTS

Every 0 is next to 0 4's, every 1 is next to 1 2's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 3's
Diagonal of A197207


LINKS

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


EXAMPLE

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


CROSSREFS

Sequence in context: A141120 A123668 A336427 * A090436 A140616 A087456
Adjacent sequences: A197197 A197198 A197199 * A197201 A197202 A197203


KEYWORD

nonn


AUTHOR

R. H. Hardin Oct 11 2011


STATUS

approved



