A305222 Number of nX7 0..1 arrays with every element unequal to 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

0, 72, 264, 2184, 18876, 212231, 1893682, 18341237, 187726549, 1840314098, 18245534902, 183015534083, 1824304190546, 18181062439771, 181718318664105, 1815055170789611, 18120171543186402, 181005843101434032

Offset

1,2

Comments

Column 7 of A305223.

Links

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

Example

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

Crossrefs

Cf. A305223.

Sequence in context: A303081 A158488 A165139 * A316800 A004007 A279272

Adjacent sequences: A305219 A305220 A305221 * A305223 A305224 A305225

Keyword

nonn

Author

R. H. Hardin, May 27 2018

Status

approved