A186059 Number of (n+2)X7 binary arrays with each 3X3 subblock having a positive determinant

6915, 77987, 743667, 5877960, 58408337, 545528022, 4584860256, 44097747372, 410464949409, 3514156302617, 33311968188317, 310167965845840, 2682484283383291, 25173951022372310, 234600361563324997

Offset

1,1

Comments

Column 5 of A186063

Links

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

Example

Some solutions for 4X7
..0..1..1..0..0..1..0....1..1..1..1..1..1..1....1..1..0..1..1..0..1
..1..0..0..1..0..0..1....1..0..1..1..0..0..1....0..1..1..1..1..1..1
..1..1..0..1..1..0..0....1..0..0..1..1..0..0....1..0..1..1..0..1..1
..1..1..1..1..0..1..1....1..1..1..0..0..1..0....1..0..0..1..0..0..1

Crossrefs

Sequence in context: A192077 A272913 A230468 * A253612 A004243 A004244

Adjacent sequences: A186056 A186057 A186058 * A186060 A186061 A186062

Keyword

nonn

Author

R. H. Hardin Feb 11 2011

Status

approved