A305021 Number of nX7 0..1 arrays with every element unequal to 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.

0, 702, 10487, 570806, 24498639, 1125868355, 51145342760, 2330913035532, 106184262061654, 4838827075531557, 220480153855823492, 10046790366410275173, 457802551646014275739, 20860807824396398424481

Offset

1,2

Comments

Column 7 of A305022.

Links

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

Example

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

Crossrefs

Cf. A305022.

Sequence in context: A321641 A304064 A305456 * A316685 A304766 A316510

Adjacent sequences: A305018 A305019 A305020 * A305022 A305023 A305024

Keyword

nonn

Author

R. H. Hardin, May 23 2018

Status

approved