

A197665


Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 4,0,1,0,1 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 0's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 1's
Diagonal of A197672


LINKS

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


EXAMPLE

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


CROSSREFS

Sequence in context: A098450 A065456 A052389 * A064504 A090448 A264219
Adjacent sequences: A197662 A197663 A197664 * A197666 A197667 A197668


KEYWORD

nonn


AUTHOR

R. H. Hardin Oct 17 2011


STATUS

approved



