A187308 Half the number of (n+2) X (n+2) binary arrays with each 3 X 3 subblock having sum 3, 4, 5 or 6.

210, 18792, 5422402, 5243407780, 16720419105846, 176072290483114471, 6123962812371625570408

Offset

1,1

Comments

Diagonal of A187317.

Links

Table of n, a(n) for n=1..7.

Example

Some solutions for 4 X 4 with a(1,1)=0:
..0..1..1..0....0..1..0..1....0..1..1..1....0..0..0..1....0..0..1..0
..1..0..0..1....0..0..0..1....1..0..0..0....0..1..0..0....0..0..1..1
..1..1..0..1....1..0..1..0....1..1..1..0....1..0..1..0....1..1..0..0
..1..1..1..0....1..0..0..1....1..1..0..0....0..0..1..1....0..0..1..0

Crossrefs

Sequence in context: A035840 A140904 A092711 * A229754 A089514 A289328

Adjacent sequences: A187305 A187306 A187307 * A187309 A187310 A187311

Keyword

nonn

Author

R. H. Hardin, Mar 08 2011

Status

approved