A183686 Number of (n+1)X8 binary arrays with every 2X2 subblock nonsingular

384, 3472, 28160, 239424, 1992320, 16748160, 140090240, 1174759296, 9838208512, 82449830016, 690711971456, 5787565930752, 48489078457728, 406275347589248, 3403932556101120, 28520064001053824, 238954333647573120

Offset

1,1

Comments

Column 7 of A183688

Links

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

Formula

Empirical: a(n)=7*a(n-1)+57*a(n-2)-332*a(n-3)-1122*a(n-4)+5412*a(n-5)+9248*a(n-6)-35984*a(n-7)-26624*a(n-8)+82304*a(n-9)

Example

Some solutions for 3X8
..0..1..1..1..1..1..1..1....0..1..0..1..0..1..0..1....1..1..1..0..1..0..1..1
..1..0..1..0..1..0..1..0....1..0..1..1..1..1..1..1....1..0..1..1..0..1..0..1
..0..1..1..1..0..1..0..1....0..1..1..0..1..0..1..0....0..1..0..1..1..1..1..1

Crossrefs

Sequence in context: A236029 A252904 A252899 * A134241 A203980 A061403

Adjacent sequences: A183683 A183684 A183685 * A183687 A183688 A183689

Keyword

nonn

Author

R. H. Hardin Jan 06 2011

Status

approved