

A196629


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


0




OFFSET

1,2


COMMENTS

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


LINKS



EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



