A305446 Number of nXn 0..1 arrays with every element unequal to 1, 2, 4, 5 or 8 king-move adjacent elements, with upper left element zero.

0, 3, 7, 26, 1275, 5443, 222961, 10709608, 362139243, 59746224393

Offset

1,2

Comments

Diagonal of A305452.

Links

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

Example

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

Crossrefs

Cf. A305452.

Sequence in context: A120120 A126472 A019059 * A334793 A175198 A272530

Adjacent sequences: A305443 A305444 A305445 * A305447 A305448 A305449

Keyword

nonn

Author

R. H. Hardin, Jun 01 2018

Status

approved