A183455 Number of n X 8 binary arrays with every 1 having exactly three king-move neighbors equal to 1.

1, 19, 63, 139, 723, 3005, 9511, 36995, 150145, 547767, 2049243, 8099185, 31232375, 118794973, 475013103, 1906016687, 7508667425, 31409068325, 132833355231, 551489805231, 2461668875187, 11088714849657, 48962978982683

Offset

1,2

Comments

Column 8 of A183456.

Links

R. H. Hardin, Table of n, a(n) for n = 1..178

Example

Some solutions for 5 X 8
..1..1..0..0..0..0..0..0....0..0..0..0..0..0..1..1....0..1..1..0..0..0..1..1
..1..1..0..1..1..0..0..0....0..0..0..0..0..0..1..1....0..1..1..0..0..0..1..1
..0..0..0..1..1..0..0..0....0..1..1..0..0..0..0..0....0..0..0..0..0..0..0..0
..1..1..0..0..0..0..1..1....0..1..1..0..0..1..1..0....0..0..1..1..0..0..1..1
..1..1..0..0..0..0..1..1....0..0..0..0..0..1..1..0....0..0..1..1..0..0..1..1

Crossrefs

Cf. A183456.

Sequence in context: A262317 A214150 A262920 * A183340 A195749 A093485

Adjacent sequences: A183452 A183453 A183454 * A183456 A183457 A183458

Keyword

nonn

Author

R. H. Hardin, Jan 05 2011

Status

approved