A317870 Number of nX7 0..1 arrays with every element unequal to 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 22, 10, 1089, 3303, 27620, 163297, 1242087, 7872632, 53760082, 353252004, 2390946331, 15793996654, 106138988508, 705385250439, 4723352116586, 31474104782001, 210349127355642, 1403285636312709, 9371971431288242

Offset

1,2

Comments

Column 7 of A317871.

Links

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

Example

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

Crossrefs

Cf. A317871.

Sequence in context: A104061 A196103 A196100 * A195906 A033342 A102612

Adjacent sequences: A317867 A317868 A317869 * A317871 A317872 A317873

Keyword

nonn

Author

R. H. Hardin, Aug 09 2018

Status

approved