A183454 Number of nX7 binary arrays with every 1 having exactly three king-move neighbors equal to 1

1, 13, 37, 73, 310, 1077, 2906, 9511, 32518, 99333, 312764, 1046598, 3343633, 10652049, 35996876, 117867538, 385635340, 1352230379, 4561605207, 15531139532, 57467708700, 201840310959, 722812200876, 2823705961715, 10358130143326

Offset

1,2

Comments

Column 7 of A183456

Links

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

Example

Some solutions for 5X7
..0..0..0..0..0..0..0....0..1..1..0..1..1..0....1..1..0..0..0..1..1
..0..1..1..0..0..0..0....0..1..1..0..1..1..0....1..1..0..0..0..1..1
..0..1..1..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..0
..0..0..0..0..0..1..1....0..1..1..0..1..1..0....0..0..0..0..0..0..0
..0..0..0..0..0..1..1....0..1..1..0..1..1..0....0..0..0..0..0..0..0

Crossrefs

Sequence in context: A155301 A155284 A155304 * A155265 A155253 A155234

Adjacent sequences: A183451 A183452 A183453 * A183455 A183456 A183457

Keyword

nonn

Author

R. H. Hardin Jan 05 2011

Status

approved