

A197310


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


0




OFFSET

1,3


COMMENTS

Every 0 is next to 0 0's, every 1 is next to 1 1's, every 2 is next to 2 1's, every 3 is next to 3 0's, every 4 is next to 4 0's
Diagonal of A197317


LINKS

Table of n, a(n) for n=1..9.


EXAMPLE

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


CROSSREFS

Sequence in context: A208170 A088694 A208583 * A266525 A085330 A222628
Adjacent sequences: A197307 A197308 A197309 * A197311 A197312 A197313


KEYWORD

nonn


AUTHOR

R. H. Hardin Oct 13 2011


STATUS

approved



