A304951 Number of n X 7 0..1 arrays with every element unequal to 0, 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.

1, 99, 120, 287, 1436, 5296, 18950, 76117, 313593, 1223755, 4910872, 20032709, 79956642, 322609167, 1304677522, 5257674436, 21210939485, 85682310404, 345796184542, 1395755609802, 5635920794015, 22752476546255, 91855101525832

Offset

1,2

Comments

Column 7 of A304952.

Links

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

Example

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

Crossrefs

Cf. A304952.

Sequence in context: A072433 A133650 A045298 * A316619 A354500 A039446

Adjacent sequences: A304948 A304949 A304950 * A304952 A304953 A304954

Keyword

nonn

Author

R. H. Hardin, May 22 2018

Status

approved