

A197523


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


0




OFFSET

1,3


COMMENTS

Every 0 is next to 0 4's, every 1 is next to 1 4'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 A197529


LINKS

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


EXAMPLE

Some solutions containing all values 0 to 4 for n=4
..0..0..1..2....0..0..3..0....0..2..1..2....0..0..3..0....0..0..0..0
..0..1..4..1....2..1..0..3....0..1..4..1....0..1..0..0....0..1..0..3
..0..0..1..2....1..4..1..0....0..0..1..2....1..4..1..0....1..4..1..0
..0..3..0..0....0..1..2..0....0..3..0..0....2..1..2..0....0..1..2..0


CROSSREFS

Sequence in context: A317609 A251782 A267324 * A283546 A297685 A303725
Adjacent sequences: A197520 A197521 A197522 * A197524 A197525 A197526


KEYWORD

nonn


AUTHOR

R. H. Hardin Oct 16 2011


STATUS

approved



