

A196679


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


LINKS



EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



