A251674 Number of (n+2) X (n+2) 0..2 arrays with no row, column, diagonal or antidiagonal in any 3 X 3 subblock summing to 2 or 4.

293, 865, 5527, 64309, 1374165, 47407259, 2525118941, 207194435581, 26296727620193, 5146601734676793, 1551231801668961273

Offset

1,1

Comments

Diagonal of A251682.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A251682.

Sequence in context: A142784 A142847 A142558 * A217182 A109562 A023305

Adjacent sequences: A251671 A251672 A251673 * A251675 A251676 A251677

Keyword

nonn

Author

R. H. Hardin, Dec 06 2014

Status

approved