

A233067


Number of n X n 0..3 arrays with no element x(i,j) adjacent to value 3x(i,j) horizontally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 in row major order


1




OFFSET

1,2


COMMENTS



LINKS



EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



