

A230903


Number of n X n 0..3 arrays x(i,j) with each element horizontally, vertically or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, no adjacent elements equal, and upper left element zero


0




OFFSET

1,2


COMMENTS



LINKS



EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



