A187639 Number of (n+2)X(n+2) 0..2 arrays with each 3X3 subblock having sum 9

3139, 79259, 1342083, 17048731, 234213387

Offset

1,1

Comments

Diagonal of A187645

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for 4X4
..0..2..0..1....1..1..1..0....1..2..1..0....1..2..1..1....0..1..2..0
..1..0..0..0....1..1..0..1....1..1..0..0....1..0..0..2....2..0..0..1
..2..2..2..2....0..2..2..1....0..1..2..2....2..2..0..1....1..1..2..2
..0..0..2..1....1..1..1..0....1..2..1..0....1..2..1..1....1..0..2..1

Crossrefs

Sequence in context: A180297 A187645 A187640 * A322536 A172641 A172744

Adjacent sequences: A187636 A187637 A187638 * A187640 A187641 A187642

Keyword

nonn

Author

R. H. Hardin Mar 12 2011

Status

approved