

A251242


Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock having the sum of its diagonal elements less than the minimum of its antidiagonal elements


1




OFFSET

1,1


COMMENTS



LINKS



EXAMPLE

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


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



