A318092 Number of nXn 0..1 arrays with every element unequal to 1, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 5, 45, 1563, 73788, 8985801, 2154127036, 1097965368750, 1190615089872919, 2722471379059198849

Offset

1,2

Comments

Diagonal of A318098.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A318098.

Sequence in context: A326650 A323572 A368491 * A050641 A112396 A317861

Adjacent sequences: A318089 A318090 A318091 * A318093 A318094 A318095

Keyword

nonn

Author

R. H. Hardin, Aug 16 2018

Status

approved