A305244 Number of nX7 0..1 arrays with every element unequal to 0, 1, 2, 4 or 8 king-move adjacent elements, with upper left element zero.

64, 432, 343, 2128, 11731, 55039, 311014, 1742187, 9652212, 54215925, 304136859, 1705204672, 9572981971, 53722180818, 301526832227, 1692432742507, 9499376400246, 53319042252526, 299275626808768, 1679809896380902

Offset

1,1

Comments

Column 7 of A305245.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=5
..0..0..0..0..0..0..0. .0..0..1..1..0..1..1. .0..0..1..0..0..1..1
..0..0..1..0..0..1..0. .0..0..0..0..0..0..0. .1..1..1..1..1..1..1
..0..0..0..0..0..0..0. .0..0..0..0..0..0..0. .1..1..1..1..1..1..1
..1..0..0..0..0..1..0. .0..0..0..0..0..0..0. .1..1..1..1..1..1..1
..0..1..0..0..0..0..0. .0..0..0..0..0..0..0. .1..0..0..1..1..0..0

Crossrefs

Cf. A305245.

Sequence in context: A184773 A184765 A303799 * A304478 A316303 A304847

Adjacent sequences: A305241 A305242 A305243 * A305245 A305246 A305247

Keyword

nonn

Author

R. H. Hardin, May 28 2018

Status

approved