A183453 Number of nX6 binary arrays with every 1 having exactly three king-move neighbors equal to 1

1, 9, 23, 43, 147, 439, 1077, 3005, 8707, 23625, 64333, 181321, 509237, 1397553, 3922583, 11252577, 31296857, 88869587, 262342415, 745005339, 2165854075, 6666351495, 19567488007, 58799922721, 190395211135, 583866245179

Offset

1,2

Comments

Column 6 of A183456

Links

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

Example

Some solutions for 5X6
..0..0..0..1..1..0....0..0..0..0..0..0....0..0..1..1..0..0....0..0..0..0..0..0
..0..0..0..1..1..0....0..1..1..0..0..0....0..0..1..1..0..0....0..0..1..1..0..0
..1..1..0..0..0..0....0..1..1..0..0..0....0..0..0..0..0..0....0..0..1..1..0..0
..1..1..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..0..0..0..1..1....0..1..1..0..1..1....0..0..0..0..0..0

Crossrefs

Sequence in context: A144390 A024843 A363161 * A296311 A159221 A079040

Adjacent sequences: A183450 A183451 A183452 * A183454 A183455 A183456

Keyword

nonn

Author

R. H. Hardin Jan 05 2011

Status

approved