A305083 Number of n X n 0..1 arrays with every element unequal to 1, 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero.

0, 7, 22, 91, 3384, 101803, 630306, 219093711, 154688671720, 18351872937934

Offset

1,2

Comments

Diagonal of A305089.

Links

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

Example

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

Crossrefs

Cf. A305089.

Sequence in context: A302273 A151822 A302724 * A231214 A041913 A231339

Adjacent sequences: A305080 A305081 A305082 * A305084 A305085 A305086

Keyword

nonn

Author

R. H. Hardin, May 25 2018

Status

approved