

A239332


Number of n X n 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of the elements above it, modulo 4


0




OFFSET

1,1


COMMENTS



LINKS



EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



