A183781 Half the number of (n+1)X9 binary arrays with no 2X2 subblock having exactly 2 ones

3653, 83799, 1604473, 34228999, 701022093, 14750484447, 307446383061, 6453534773135, 135163113130301, 2836308059464159, 59486265398855701, 1248295058919868871, 26191521416003319909, 549635175272088975695

Offset

1,1

Comments

Column 8 of A183782

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions with a(1,1)=0 for 3X9
..0..1..1..1..1..1..1..1..1....0..0..1..1..1..1..1..1..0
..1..1..1..1..1..1..0..1..0....0..0..0..1..1..1..1..1..1
..1..1..0..1..1..1..1..1..1....1..0..0..0..1..1..0..1..1

Crossrefs

Sequence in context: A232837 A252086 A212852 * A252678 A307937 A190923

Adjacent sequences: A183778 A183779 A183780 * A183782 A183783 A183784

Keyword

nonn

Author

R. H. Hardin Jan 07 2011

Status

approved