A320408 Number of nX7 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

64, 700, 7049, 92578, 1353623, 19677729, 282206549, 4085687781, 58997871413, 854291464126, 12364136018320, 178956311530396, 2590922938391319, 37511252836334859, 543116212765934101, 7863666564278921803

Offset

1,1

Comments

Column 7 of A320409.

Links

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

Example

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

Crossrefs

Cf. A320409.

Sequence in context: A187620 A119287 A318023 * A223963 A372844 A303726

Adjacent sequences: A320405 A320406 A320407 * A320409 A320410 A320411

Keyword

nonn

Author

R. H. Hardin, Oct 12 2018

Status

approved